PT8A2641-2642/2645-2648
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PIR Sensor Light Switch
Product Features
Product Description
Operating voltage: 5V (Typ.)
Average supply current: 120µA (Typ.)
2 stage op-amp for filter.
Build-in noise rejection circuit.
On-chip regulator.
Adjustable output duration
Override function.
ON/AUTO/OFF selectable by MODE pin
Apply to AC 220V/50Hz and 110V/60Hz.
Auto-reset if the ZC signal disappears over 3
The PT8A264X is a CMOS LSI chip designed
for use in automatic PIR lamp control. It can operate
with a 2-wire configuration for triac applications or
with a 3-wire configuration for relay applications.
The chip is equipped with operational amplifiers, a
comparator, timer, a zero crossing detector, control
circuit, a voltage regulator, a system oscillator, and
an output timing oscillator.
Its PIR sensor detects infrared power variations
induced by the motion of a human body and
transforms it to a voltage variation. If the PIR output
voltage variation conforms to the criteria (refer to the
functional description), the lamp is turned on with an
adjustable duration. The PT8A264X offers three
operating modes (ON, AUTO, OFF) which can be set
through the MODE pin. While the chip is working in
the AUTO mode the user can override it and switch
to the quickly install mode, or manual ON mode, or
return to the AUTO mode by switching the power
switch.
seconds
Output pulse (PT8A2641/5/7) to drive triac or
output level (PT8A2642/6/8) to drive relay.
CDS to enable/disable output.
40 second warm-up.
Quick check mode for installation.
Block Diagram
Figure 1 Block Diagram
OP2O
OP2N
_
OP2P
+
Comparator
OP1N
+
_
Regulator
Output
circuit
OSCS
delay
oscillator
Delay
circuit
System
oscillator
Frequency
divider
12-07-0006
MODE
CDS
COMPO
CDSO
RSTB
Control
circuit
VEE
OSCD
Mode and CDS
control circuit
Voltage
divider
OP1O
OP1P
latch circuit
RELAY
TRIAC
GND
Vcc
Zero cross
debounce
ZC
PT0192-3
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07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Pin Configuration
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RSTB
VEE
GND
RELAY
OSCD
OSCS
ZC
CDS
MODE
Vcc
PT8A2641P/2641W
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RSTB
VEE
PT8A2642P/2642W
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
CDSO
VEE
GND
RELAY
OSCD
OSCS
ZC
CDS
MODE
Vcc
PT8A2645P/2645W
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
CDSO
VEE
PT8A2646P/2646W
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
COMPO
VEE
GND
RELAY
OSCD
OSCS
ZC
CDS
MODE
Vcc
PT8A2647P/2647W
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
COMPO
VEE
PT8A2648P/2648W
12-07-0006
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PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Pin Description
2641
2642
1
1
Part number
2645 2646 2647
1
1
1
2648
1
Pin name
I/O
GND
I
Description
Ground
RELAY drive output through an external NPN
2
2
2
RELAY
O
transistor, active high
TRIAC drive to output two negative pulses, active
2
2
2
TRIAC
O
negative pulse.
Output timing oscillator I/O
3
3
3
3
3
3
OSCD
I/O It is connected to an external RC to adjust output
duration.
System oscillator I/O OSCS is connected to an
4
4
4
4
4
4
OSCS
I/O external RC to set the system frequency. The
system frequency =16KHz for normal application.
5
5
5
5
5
5
ZC
I
Schmitt input for AC zero crossing detection
CDS is connected to a CDS voltage divider for
daytime/night auto-detection. Low input to this pin
6
6
6
6
6
6
CDS
I
can disable the PIR input. CDS is a schmitt trigger
input with 5-second input debounce time.
Operating mode selection input:
VCC: TRIAC/RELAY is always ON
7
7
7
7
7
7
MODE
I/O GND: TRIAC/RELAY is always OFF
Open: Auto detection, outputs 31.25Hz square
wave
8
8
8
8
8
8
Vcc
I
Positive power supply
Regulated voltage output The output voltage is
9
9
9
9
9
9
VEE
O
about 3.6V with respect to GND.
10
10
RSTB
I
Chip reset input, active low
10
10
CDSO
CDS control circuit output signal, active high
10
10
COMPO
output of comparator, active high
11
11
11
11
11
11
OP1P
I
Noninverting input of OP1
12
12
12
12
12
12
OP1N
I
Inverting input of OP1
13
13
13
13
13
13
OP1O
O Output of OP1
14
14
14
14
14
14
OP2P
I
Noninverting input of OP2, internal 1.8V default.
15
15
15
15
15
15
OP2N
I
Inverting input of OP2
16
16
16
16
16
16
OP2O
O Output of OP2
Note: The active output width of COMPO is inversely proportional to the system frequency.
12-07-0006
PT0192-3
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07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Maximum Ratings
Storage temperature - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - -- - - - - -40°C to +125°C
Supply Voltage to Grourd Potential (Input & VCC Only) - - - - - -GND -0.5V to Vcc+0.5V
Supply Voltage to Grourd Potential (output & D/O Only)- - - - - GND -0.5V to Vcc+0.5V
DC Input Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -0.5V to + 6.0V
DC Output Current - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - 20mA
Power Dissipation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -500mW
Note:
Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating only
and functional operation of the device at these or
any other conditions above those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
reliability.
Recommended Operating Conditions
Symbol
Parameter
VCC
Operating Voltage
-
VIH
“H” Input Voltage
VIL
Test Condition
Condition
Min.
Typ.
Max.
Unit
-
4.75
5.0
6.0
V
-
-
0.8
-
-
VCC
“L” Input Voltage
-
-
-
-
0.2
VCC
FSYS
System Oscillator Frequency
5V
ROSCS=430K
COSCS=180P
12.8
16
19.2
KHz
TA
Operating temperature
-
-
-20
25
70
°C
Min.
Typ.
Max.
Unit
3.0
0.9
2.6
1.1
2.7
0.8
2.7
0.8
3.3
1.2
2.9
1.4
3
1
3
1
3.6
1.5
3.2
1.7
3.3
1.2
3.3
1.2
V
V
V
V
V
V
V
V
VCC
Electrical Characteristics
Symbol
Parameter
VTH1
VTL1
VTH2
VTL2
VTH3
VTL3
VTH4
VTL4
CDS “H” Transfer Voltage
CDS “L” Transfer Voltage
ZC “H” Transfer Voltage
ZC “L” Transfer Voltage
OSCS “H” Transfer Voltage
OSCS “L” Transfer Voltage
OSCD “H” Transfer Voltage
OSCD “L” Transfer Voltage
High level leakage current
(ZC,CDS)
Low level leakage current
(ZC,CDS)
RSTB Input high level current
Output source current(RELAY,
TRIAC)
Output sink current(RELAY,
TRIAC)
Output source
Current(CDSO,COMPO)
Output sink
current(CDSO,COMPO)
I IH
I IL
I IHRSTB
IOH
IOL
IOH
IOL
VCC
5V
5V
5V
5V
5V
5V
5V
5V
Test Condition
Condition
5V
VIH=4.5V
-1
-
1
A
5V
VIL=0.5V
-1
-
1
A
5V
VIH=4.5V
-1
-
-5
A
5V
VOH=4.5V
–6
-
-
mA
5V
VOL=0.5V
15
-
-
mA
5V
VOH=4.5V
–5
-
-
mA
5V
VOL=0.5V
5
-
-
mA
12-07-0006
PT0192-3
4
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Voltage regulation circuit
Symbol
Parameter
VEE
OP2P
Regulator Output Voltage
Noninverting input of OP2
Line regulation
Load regulation
VO
VLDR
VCC
5V
5V
5V
Test Condition
Condition
No load
No load
4.5VCC5.5V, IL =1mA
0.5mA IL2mA
Min.
Typ.
Max.
Unit
3.24
1.62
-
3.6
1.8
30
60
3.96
1.98
50
100
V
V
mV
mV
Operational amplifier and windows comparator
Symbol
BW
Description
3dB band width
Test condition
-
Min
10
TYP
-
Max
-
Unit
KHz
VH
Threshold of windows
comparator
VCC=5V
1.8
2.0
2.2
V
VCC=5V
1.35
1.5
1.65
V
Min
25
Typ
31.25
Max
37.5
Unit
Hz
1.16
1.45
1.74
ms
50
62.5
75
s
-
125
200
s
VL
Frequency of oscillator and Timing of ZC and trigger output
Symbol
FMODE
Description
Oscillator frequency/512
TDZT
Delay time from ZC to TRIAC
TTPW
TRIAC Pulse Width
Delay time from ZC rising edge
to Relay
TDZR
Test condition
VCC=5V, RS=430K ,CS=180P
(PT8A264X)
Power Dissipation
Symbol
Description
Test condition
Min
Typ
Max
Unit
ICC
Power supply current
VCC=5V, RS=430K ,CS=180P,
RD =2M, CD=104, other Input
Pins=GND, all outputs float.
-
120
200
A
12-07-0006
PT0192-3
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07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Functional Description
VEE: supplies power to the analog front end circuit, it is about a stable 3.6V with respect to GND normally.
OSCS: a system oscillator input pin. System frequency of 16KHz can be generated when connecting to an external RC shows
as figure 2 (R=430K, C=180pf).
Figure 2 System oscillator
Figure 3 Output timing oscillator
TD= 23552 /FOSCD
RS
VTH3
430k
OSCS
+
+
-
OSCD
+
VTL3 +
CS
VTH4
RD
CD
+
+
-
+
VTL4 +
180P
PT8A264X
PT8A264X
OSCD: input pin of timing oscillator. It’s connected to an external RC to obtain the desired output timer. Variable output turnon duration can be achieved by selecting various values of RC or using a variable resistor, see figure 3.
Note: The minimum resistor should be low enough to 2K in order to provide adjustable range about 1000 times between min
and max timer (The maximum resistor is 3M). It is recommended that CD is more than 103 in order to guarantee not too bad
linearity.
RELAY (TRIAC): an output pin set as a RELAY driving (active high) output for the PT8A2642/6/8, or as a TRIAC driving
(active low) output for the PT8A2641/5/7. The output active duration is controlled by the OSCD oscillating period.
CDS and CDSO: CDS has a schmitt trigger input structure. It is used to distinguish lighteness. With a resistor divider
including a CDS component, if light is weak enough, CDS is high the PIR input is active. Oppositely, the CDSO will be
inactive when CDS is low. The input debounce time from inactive to active is 5 seconds. CDS should be pulled high without
using this function. The input of CDS will be ignored once the output is active.
CDS
LOW
HIGH
Status
Day Time
Night
CDSO
inactive
active
Figure 4 CDS input interface and enable debounce
RW
CDS
Photo
Resistor
CDS
CDS CDSO enable
5s
disable
enable
Figure 5 RSTB application example
RSTB: used to reset the chip. It is internal pull-high and active low.
The use of CRST can extend the power-on initial time. If the RSTB pin
is an open circuit (without CRST), the initial time is the default (40
secs).
VC
C
RES
T
RST
B
CRST
VSS
12-07-0006
PT0192-3
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PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Power on initial: Because the band-pass filter and amplifier require a warm up period to reach a stable state after power-on so
any inputs should be ignored during this period.
In the AUTO mode within the first 10 seconds of power-on initialization, the system allows override control to access the
quickly install mode. However, after 40 seconds of the initial time the system allows override control between ON and AUTO.
It will remain in the warm up period if the total initial time has not elapsed after returning to AUTO.
In case that the ZC signal disappears more than 3 seconds, the chip will restart the initialization operation. However, the restart
initial time is always 40 seconds and cannot be extended by adding CRST to the RSTB pin as shown in Fig.5.
MODE: a tri-state input pin used to select the operating mode.
MODE
VCC
Operating Mode
Output always ON
GND
Output always OFF
Open
AUTO
Description
RELAY outputs high at ZC rising edge
TRIAC outputs negative pulse train with synchronizing to ZC
RELAY outputs low
TRIAC outputs high
Outputs remain off state until activated by a valid PIR trigger signal. When working in
the AUTO mode, the chip allows override control by switching the ZC signal. MODE
outputs square wave with frequency of 31.25Hz.
ZC: a CMOS input structure. It receives AC line frequency and generates zero crossing pulses to synchronize the triac/relay
driver. With an effective ZC signal switching (switch OFF/ON 2 times within 3 seconds), the system provides the following
additional functions:
Quickly install mode: Within 10 seconds after power-on, effective ZC switching will force the chip to enter the quickly
install mode. During the mode, the outputs will be active for a duration of 1.3 seconds each time a valid PIR trigger signal
is received. If a time interval exceeds 32 seconds without a valid trigger input, the chip will enter the AUTO mode
automatically.
Figure 6 Test mode
10s
RSTB
40s warm up time
Test enable
ZC
0.34s
Relay
(Triac)
*
OFF
**
ON
1.3s
2s
ON
1.3s
ON
1.3s
2s
ON
1.3s
>32s
*&**:flash33times
timesatat2Hz
2Hz
rate
2641;for 2642,No
flash flash
*&**:flash
rate
forfor
2641/5/7;for
2642/6/8,No
Override control: When the chip is working in the AUTO mode (MODE= open), the output is activated by a valid PIR trigger
signal and the active output duration is controlled by the OSCD oscillating period. The lamp can be switched always to “ON”
from the AUTO mode by either switching the MODE pin to VCC or switching the ZC signal by an OFF/ON operation of the
power switch (OFF/ON twice within 3 seconds). The term "override" refers to the change of operating mode by switching the
power switch. The chip can be toggled from ON to AUTO by an override operation. Shows as figure 7.
If the chip is overridden to ON and there is no further override operation, it will return to AUTO automatically after an
internal preset ON time duration has elapsed. This override ON time duration is set to 5 hours, refer to fig 7.
The PT8A2641/5/7 will flash on output pin when changing the operating mode. It will flash 3 times at a 1Hz rate each time
the chip changes from the AUTO mode to another mode or flash 3 times at a 2Hz rate when returning to the AUTO mode.
But
PT8A2642//6/8 does no flash at the same condition.
However, if the AUTO mode is changed by switching the MODE switch output will not flash.
12-07-0006
PT0192-3
7
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Figure 7 ZC override timing
Operating
Mode
AUTO
flash
flash
ON
AUTO
flash
flash
ON
AUTO
5 hours
ZC
Any operations during flash period are inactive, the flash period is about 3s from AUTO to ON, 3s from ON to AUTO.
COMPO: COMPO is output from comparator, it can be output at pin 10 if needed. Signal from two-stage opamp outputs to a
window comparator as pre-operation, COMPO outputs active positive pulses with various width once signal beyond window
level. Whether an active PIR signal is detected, see trigger timming diagram below for detail.
Trigger timing
Figure 8 Trigger timing
RSTB
CDS
5s
CDSO
+trigger
level
OP2O
-trigger
level
>T mt
(Note1)
COMPO
< T mt
Detect
Enable
Test
Enable
(Note2)
Warm up 40s
10s
ON
RELAY
TRIAC
pulse out
ON
(Note3)
Note: 1. One measurable trigger width (Tmt) from comparator output is 24ms~ 32ms which varies with frequency of system
oscillator (typical system frequency=16KHz ).
2. The output is activated if the trigger signal conforms to the following criteria:
A trigger signal sustain duration:0.34 seconds.
2 trigger signals within 2 seconds with one of the trigger signal sustain:0.16 seconds.
More than 3 measurable triggers within 2 seconds.
3. The output duration is set by an external RC that is connected to the OSCD pin.
Retrigger
If another signal is attained in trigger hold time, the circuit will be retriggered, and the trigger hold time will be started from
this time.
12-07-0006
PT0192-3
8
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Timing Diagram
ZC
TDZR
RELAY
ZC
TDZT
TDZT
TRIAC
TTPW
7*TTPW
TTPW
Application Circuits
Typical application circuit of two wires PIR detector
SW1
ON/OFF OVERRIDE
C3
1 80 P
C7
1 04
R6
1
VCC
2
R1 5 1 5K
LAMP
2 0~1 0 0W
C8
1 04
R9
2M
C
1 20 p
4
R8
4 30 K
2
6 8/2 W
D3
1 N62 6 3
6
OFF
AUTO
ON
2M
C1 0
VCC
D5
0 .3 3 U/6 30 V
1 N40 0 7
Q1
4 70 UF/1 6 V
1
3
TRIAC
AC 1 1 0V~2 30 V
R1
2 0K
MODE7
SW2
D4
1 N41 4 8
8
VSS
TRIAC
D1
6 .2 V
OP2O
OP2N
OSCD
OP2P
OSCS
OP1O
ZC
OP1N
CDS
MODE
VDD
OP1P
CDSO
RSTB
COMPO
VEE
16
15
14
13
C6
2 03
2 2UF/1 6 V
R5
2 2K
C9
1 0UF/1 6 V
C2
2 03
11
R4
1M
10
9
C4
1 00 UF/1 6 V
R1 3
CDS
C5
12
PT8 A2 6 41 /5 /7
R1 0
C1 1
D2
1 N40 0 7
5
R2
1 M R1 1
R1 4
3
R7
2M
1M
U2
R1 2
2 2K
R3
U1
D
S
G
5 6K
C1 2
2 2UF/1 6 V
2 03 C1 3
C1
1 00 UF/1 6 V
Note:
1. Adjust R10 to fit various CDS.
2. Change C7 to obtain the desired adjusting range of output duration.
3. Change the value of C10 to 0.22uf/630V for AC 220V application.
12-07-0006
PT0192-3
9
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Typical application circuit of three wires PIR detector
LAMP
2 0~1 0 0W
relay
15mA
R1 1 1 M
K1
D1
IN4 0 01
Q1
9 01 4
C6
1 04
R1 4 5 6K
C3
1 80 P 1
2
R1 0 2 M
R1 6
3
2K
VCC
R9
4
4 30 K
R8
5
3 60 k
6
R1 5 1 M
0 .6 8 U/4 00 V
R6
SW2
8
MODE
6 8/2 W
D2
2 4V
R7
2 .4 M
D4
1 N41 4 8
R1 2
OP2O
RELAY
OP2N
OSCD
OP2P
OSCS
OP1O
ZC
OP1N
CDS
MODE
VDD
OP1P
CDSO
RSTB
COMPO
VEE
16
C8
2 03
15
14
C7
2 2UF/1 6 V
R5
2 2K
C1 0
1 0UF/1 6 V
13
C2
2 03
12
R4
1M
11
10
R2
9
R3
2 2K
5 6K
PT8 A2 6 42 /6 /8
C4
1 00 UF/1 6 V
VCC
1K
D3
2 4V
VSS
ON
C1 1
D5
1 N40 0 7
OU
FFT O
A
nature
7
U2
U1
D
S
G
C1 2
C1
2 2UF/1 6 V
2 03
D7
R1 3
5 .6 V
AC 1 1 0V~2 30 V SW1
ON/OFF OVERRIDE
live
D6
1 N40 0 7
C5
4 70 UF/3 5 V
R1
CDS
C9
3 30 UF/1 6 V
Note: 1.Adjust R13 to fit various CDS.
2.Change C6 to obtain the desired adjusting range of output duration.
3. RSTB pin need a capacitance 104 for PT8A2642 application
12-07-0006
PT0192-3
10
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Mechanical Information
16-Pin DIP
PKG. DIMENSIONS(MM)
SYMBOL
Min
Max
A
3.71
4.31
A1
0.51
A2
3.20
3.60
B
0.38
0.57
B1
1.52 BSC
c
0.20
0.36
D
18.80
19.20
E
6.20
6.60
E1
7.32
7.92
e
2.54 BSC
L
3.00
3.60
Note:
1) Controlling dimensions in millimeters.
2) Ref : JEDEC MS-001D/BB
E2
12-07-0006
8.40
PT0192-3
11
9.00
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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16-Pin SOIC
PKG. DIMENSIONS(MM)
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
A2
1.35
1.55
b
0.33
0.51
c
0.17
0.25
D
9.80
10.20
E
3.80
4.00
E1
5.80
6.20
e
1.27 BSC
L
0.40
1.27
θ
0°
8°
Note:
1) Controlling dimensions in millimeters.
2) Ref : JEDEC MS-012E/AC
12-07-0006
PT0192-3
12
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Ordering Information
Part Number
Package code
Package
PT8A2641PE
P
Lead free 16-Pin DIP
PT8A2641WE
W
Lead free 16-Pin SOIC
PT8A2642PE
P
Lead free 16-Pin DIP
PT8A2642WE
W
Lead free 16-Pin SOIC
PT8A2645PE*
P
Lead free 16-Pin DIP
PT8A2645WE*
W
Lead free 16-Pin SOIC
PT8A2646PE*
P
Lead free 16-Pin DIP
PT8A2646WE*
W
Lead free 16-Pin SOIC
PT8A2647PE*
P
Lead free 16-Pin DIP
PT8A2647WE*
W
Lead free 16-Pin SOIC
PT8A2648PE
P
Lead free 16-Pin DIP
PT8A2648WE
W
Lead free 16-Pin SOIC
Note:
E = Pb-free and Green
Adding X Suffix= Tape/Reel
*Contact Pericom for availability.
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to
supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom
product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
12-07-0006
PT0192-3
13
07/06/12