TC7MB3245FT/FK
Toshiba CMOS Digital Integrated Circuit
Silicon Monolithic
TC7MB3245FT, TC7MB3245FK
Octal Bus Switch
The TC7MB3245 provides eight bits of high-speed
TTL-compatible bus switching in a standard ’245 device pinout.
The low on-state resistance of the switch allows connections to be
made with minimal propagation delay.
The device is organized as one 8-bit switch. When output
enable ( OE ) is low, the switch is on and port A is connected to
port B. When OE is high, the switch is open and a
high-impedance state exists between the two ports.
All inputs are equipped with protection circuits against static
discharge.
TC7MB3245FT
TC7MB3245FK
Features
•
Operating voltage: VCC = 4.5 to 5.5 V
•
High speed: tpd = 0.25 ns (max)
•
Low on resistance: RON = 5 Ω (typ.)
•
ESD performance: Machine model ≥ ±200 V
Human body model ≥ ±2000 V
•
Compatible with TTL outputs (control inputs)
•
Package: TSSOP20,VSSOP20 (US20)
•
Pin compatible with the 74xx245 type.
Weight
TSSOP20-P-0044-0.65A
VSSOP20-P-0030-0.50
Functionally equivalent to (FST/CBT) 3245.
: 0.08 g (typ.)
: 0.03 g (typ.)
Pin Assignment (top view)
NC
1
20
VCC
A1
2
19
OE
A2
3
18
B1
A3
4
17
B2
A4
5
16
B3
A5
6
15
B4
A6
7
14
B5
A7
8
13
B6
A8
9
12
B7
GND 10
11
B8
(top view)
NC-No Internal Connection
Start of commercial production
1999-03
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Truth Table
Inputs
Function
OE
L
A port = B port
H
Disconnect
System Diagram
A1
B1
A8
B8
OE
Absolute Maximum Ratings (Note)
Characteristics
Symbol
Rating
Unit
Power supply range
VCC
−0.5 to 7.0
V
DC input voltage
VIN
−0.5 to 7.0
V
DC switch voltage
VS
−0.5 to 7.0
V
Input diode current
IIK
−50
mA
Continuous channel circuit
IS
128
mA
Power dissipation
PD
180
mW
ICC/IGND
±100
mA
Tstg
−65 to 150
°C
DC VCC/ground current
Storage temperature
Note: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even
destruction.
Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if
the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum
ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
Operating Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage
VCC
4.5 to 5.5
V
Input voltage
VIN
0 to 5.5
V
Switch voltage
VS
0 to 5.5
V
Operating temperature
Topr
−40 to 85
°C
Input rise and fall time
dt/dv
0 to 10
ns/V
Note: The operating ranges must be maintained to ensure the normal operation of the device.
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Electrical Characteristics
DC Characteristics (Ta = −40 to 85°C)
Characteristics
Input voltage
Min
Typ.
(Note 1)
Max
4.5 to 5.5
2.0
⎯
⎯
4.5 to 5.5
⎯
⎯
0.8
4.5 to 5.5
⎯
⎯
±1.0
μA
0
⎯
⎯
±1.0
μA
4.5 to 5.5
⎯
⎯
±1.0
μA
IIS = 64 mA
4.5
⎯
5
7
IIS = 30 mA
4.5
⎯
5
7
VIS = 2.4 V, IIS = 15 mA
4.5
⎯
10
15
VIN = VCC or GND, IOUT = 0
5.5
⎯
⎯
10
μA
VIN = 3.4 V (one input)
5.5
⎯
⎯
2.5
mA
Symbol
Test Condition
“H” level
VIH
⎯
“L” level
VIL
⎯
Input leakage current
IIN
Power off leakage current
Off-STATE leakage current
(switch off)
ON resistance
(Note 2)
IOFF
ISZ
RON
Quiescent supply current
ICC
Increase in ICC per input
ΔICC
VCC (V)
VIN = 0 to 5.5 V
A, B, OE = 0 to 5.5 V
A, B = 0 to 5.5 V, OE = VCC
VIS = 0 V
Unit
V
Ω
Note 1: Typical values are at VCC = 5 V, Ta = 25°C.
Note 2: Measured by the voltage drop between A and B pins at the indicated current through the switch. On
resistance is determined by the lower of the voltages on the two (A or B) pins.
AC Characteristics (Ta = −40 to 85°C)
Characteristics
Propagation delay time
tpLH
(bus to bus)
tpHL
Output enable time
Output disable time
Min
Max
Unit
4.5
⎯
0.25
ns
Figure 1, Figure 3
4.5
⎯
5.9
ns
Figure 1, Figure 3
4.5
⎯
5.9
ns
Symbol
tpZL
tpZH
tpLZ
tpHZ
Test Condition
Figure 1, Figure 2
VCC (V)
(Note)
Note: This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay
other than the RC delay of the typical On resistance of the switch and the 50 pF load capacitance, when
driven by an ideal voltage the source (zero output impedance).
Capacitive Characteristics (Ta = 25°C)
Characteristics
Symbol
Control pin input capacitance
CIN
Switch terminal capacitance
CI/O
Test Condition
OE = VCC
VCC (V)
Typ.
Unit
(Note)
5.0
3
pF
(Note)
5.0
10
pF
Note: Parameter guaranteed by design.
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AC Test Circuit
RL
Switch
Open
7.0 V
GND
Measure
RL
CL
Output
CL = 50 pF
RL = 500 Ω
Parameter
Switch
tpLH, tpHL
Open
tpLZ, tpZL
7.0 V
tpHZ, tpZH
Open
Figure 1
AC Waveform
tf 2.5 ns
tr 2.5 ns
3.0 V
90%
1.5 V
Input
(A, B)
10%
GND
VOH
Output
(B, A)
1.5 V
tpLH
VOL
tpHL
Figure 2 tpLH, tpHL
tf 2.5 ns
tr 2.5 ns
3.0 V
90%
1.5 V
Output Enable
( OE )
10%
tpLZ
GND
tpZL
3.5 V
Output (A, B)
Low to Off to Low
1.5 V
tpHZ
VOL +
0.3 V
VOH − 0.3 V
Output (A, B)
High to Off to High
VOL
tpZH
VOH
1.5 V
GND
Outputs
enabled
Outputs
disabled
Outputs
enabled
Figure 3 tpLZ, tpHZ, tpZL, tpZH
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Package Dimensions
Weight: 0.08g (typ.)
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Package Dimensions
Weight: 0.03g (typ.)
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TC7MB3245FK
RESTRICTIONS ON PRODUCT USE
• Toshiba Corporation, and its subsidiaries and affiliates (collectively "TOSHIBA"), reserve the right to make changes to the information
in this document, and related hardware, software and systems (collectively "Product") without notice.
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TOSHIBA's written permission, reproduction is permissible only if reproduction is without alteration/omission.
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responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and
systems which minimize risk and avoid situations in which a malfunction or failure of Product could cause loss of human life, bodily
injury or damage to property, including data loss or corruption. Before customers use the Product, create designs including the
Product, or incorporate the Product into their own applications, customers must also refer to and comply with (a) the latest versions of
all relevant TOSHIBA information, including without limitation, this document, the specifications, the data sheets and application notes
for Product and the precautions and conditions set forth in the "TOSHIBA Semiconductor Reliability Handbook" and (b) the
instructions for the application with which the Product will be used with or for. Customers are solely responsible for all aspects of their
own product design or applications, including but not limited to (a) determining the appropriateness of the use of this Product in such
design or applications; (b) evaluating and determining the applicability of any information contained in this document, or in charts,
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