SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001
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Member of the Texas Instruments
Widebus+ Family
TI-OPC Circuitry Limits Ringing on
Unevenly Loaded Backplanes
OEC Circuitry Improves Signal Integrity
and Reduces Electromagnetic Interference
Bidirectional Interface Between GTLP
Signal Levels and LVTTL Logic Levels
LVTTL Interfaces Are 5-V Tolerant
Medium-Drive GTLP Outputs (50 mA)
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LVTTL Outputs (–24 mA/24 mA)
GTLP Rise and Fall Times Designed for
Optimal Data-Transfer Rate and Signal
Integrity in Distributed Loads
Ioff, Power-Up 3-State, and BIAS VCC
Support Live Insertion
Bus Hold on A-Port Data Inputs
Distributed VCC and GND Pins Minimize
High-Speed Switching Noise
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
description
The SN74GTLPH32945 is a medium-drive, 32-bit bus transceiver that provides LVTTL-to-GTLP and
GTLP-to-LVTTL signal-level translation. It is partitioned as four 8-bit transceivers. The device provides a
high-speed interface between cards operating at LVTTL logic levels and a backplane operating at GTLP signal
levels. High-speed (about three times faster than standard TTL or LVTTL) backplane operation is a direct result
of GTLP’s reduced output swing ( VCC.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001
recommended operating conditions (see Notes 4 through 7)
VCC,
BIAS VCC
Supply voltage
VTT
Termination voltage
VREF
Reference voltage
VI
Input voltage
VIH
High level input voltage
High-level
VIL
Low level input voltage
Low-level
IIK
IOH
Input clamp current
Low level output current
Low-level
∆t/∆v
Input transition rise or fall rate
∆t/∆VCC
TA
Power-up ramp rate
NOM
MAX
UNIT
3.15
3.3
3.45
V
GTL
1.14
1.2
1.26
GTLP
1.35
1.5
1.65
GTL
0.74
0.8
0.87
GTLP
0.87
1
1.1
VCC
VTT
5.5
B port
Except B port
B port
Except B port
VREF+0.05
2
B port
V
V
V
V
VREF–0.05
0.8
V
–18
mA
A port
–24
mA
A port
24
B port
50
Except B port
High-level output current
IOL
MIN
Outputs enabled
10
–40
ns/V
µs/V
20
Operating free-air temperature
mA
85
°C
NOTES: 4. All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
5. Proper connection sequence for use of the B-port I/O precharge feature is GND and BIAS VCC = 3.3 V first, I/O second, and
VCC = 3.3 V last, because the BIAS VCC precharge circuitry is disabled when any VCC pin is connected. The control and VREF inputs
can be connected anytime, but normally are connected during the I/O stage. If B-port precharge is not required, any connection
sequence is acceptable, but generally, GND is connected first.
6. VTT and RTT can be adjusted to accommodate backplane impedances if the dc recommended IOL ratings are not exceeded.
7. VREF can be adjusted to optimize noise margins, but normally is two-thirds VTT. TI-OPC circuitry is enabled in the A-to-B direction
and is activated when VTT > 0.7 V above VREF. If operated in the A-to-B direction, VREF should be set to within 0.6 V of VTT to
minimize current drain.
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SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001
electrical characteristics over recommended operating free-air temperature range for GTLP
(unless otherwise noted)
PARAMETER
VIK
VOH
A port
TEST CONDITIONS
VCC = 3.15 V,
VCC = 3.15 V to 3.45 V,
II = –18 mA
IOH = –100 µA
VCC = 3
3.15
15 V
IOH = –12 mA
IOH = –24 mA
VOL
B port
II
Control inputs
A port
IOZH‡
B port
TYP†
MAX
UNIT
–1.2
V
VCC–0.2
2.4
V
2
IOL = 100 µA
IOL = 12 mA
0.2
0.5
VCC = 3.15 V to 3.45 V,
IOL = 24 mA
IOL = 100 µA
0.2
VCC = 3.15 V
IOL = 10 mA
IOL = 40 mA
IOL = 50 mA
0.55
VI = 0 or 5.5 V
±10
VCC = 3.15 V to 3.45 V,
A port
MIN
VCC = 3
3.15
15 V
VCC = 3.45 V,
VCC = 3
3.45
45 V
0.4
0.2
0.4
VO = VCC
10
VO = 1.5 V
10
–10
IOZL‡
IBHL§
A and B ports
VCC = 3.45 V,
VO = GND
A port
IBHH¶
IBHLO#
IBHHO||
A port
VCC = 3.15 V,
VCC = 3.15 V,
VI = 0.8 V
VI = 2 V
VCC = 3.45 V,
VCC = 3.45 V,
VI = 0 to VCC
VI = 0 to VCC
VCC = 3.45 V, IO = 0,
VI (A-port or control input) = VCC or GND,
VI (B port) = VTT or GND
Outputs high
100
Outputs low
100
Outputs disabled
100
ICC
A port
A port
A or B port
Ci
Ciio
Control inputs
µA
µA
µA
75
µA
–75
µA
500
µA
µA
–500
VCC = 3.45 V, One A-port or control input at VCC – 0.6 V,
Other A-port or control inputs at VCC or GND
∆ICCk
V
mA
1
mA
pF
4.5
5
A port
VI = 3.15 V or 0
VO = 3.15 V or 0
7.5
9
B port
VO = 1.5 V or 0
7.5
9
pF
† All typical values are at VCC = 3.3 V, TA = 25°C.
‡ For I/O ports, the parameters IOZH and IOZL include the input leakage current.
§ The bus-hold circuit can sink at least the minimum low sustaining current at VILmax. IBHL should be measured after lowering VIN to GND and
then raising it to VILmax.
¶ The bus-hold circuit can source at least the minimum high sustaining current at VIHmin. IBHH should be measured after raising VIN to VCC and
then lowering it to VIHmin.
# An external driver must source at least IBHLO to switch this node from low to high.
|| An external driver must sink at least IBHHO to switch this node from high to low.
k This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
hot-insertion specifications for A port over recommended operating free-air temperature range
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
10
µA
VO = 0.5 V to 3 V,
VI or VO = 0 to 5.5 V
OE = 0
±30
µA
VO = 0.5 V to 3 V,
OE = 0
±30
µA
Ioff
IOZPU
VCC = 0,
VCC = 0 to 1.5 V,
BIAS VCC = 0,
IOZPD
VCC = 1.5 V to 0,
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SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001
live-insertion specifications for B port over recommended operating free-air temperature range
PARAMETER
TEST CONDITIONS
BIAS VCC = 0,
±30
µA
BIAS VCC = 0,
VO = 0.5 V to 1.5 V, OE = 0
±30
µA
BIAS VCC = 3
3.15
15 V to 3
3.45
45 V
V,
VO (B port) = 0 to 1.5
15V
BIAS VCC = 3.3 V,
IO = 0
VO (B port) = 0.6 V
IOZPD
VCC = 1.5 V to 0,
VCC = 0 to 3.15 V
VO
IO
VCC = 0,
UNIT
µA
BIAS VCC = 0,
VCC = 3.15 V to 3.45 V
VCC = 0,
MAX
10
VCC = 0,
VCC = 0 to 1.5 V,
ICC (BIAS VCC)
MIN
VI or VO = 0 to 1.5 V
VO = 0.5 V to 1.5 V, OE = 0
Ioff
IOZPU
BIAS VCC = 3.15 V to 3.45 V,
0.95
5
mA
10
µA
1.05
V
µA
–1
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, VTT = 1.5 V and VREF = 1 V for GTLP (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
B
OE
B
ten
tdis
tr
tf
tPLH
tPHL
ten
tdis
TYP†
MAX
2.1
6.3
2.1
6.3
2
6.9
2
6.9
UNIT
ns
ns
Rise time, B outputs (20% to 80%)
2.5
ns
Fall time, B outputs (80% to 20%)
2.1
ns
B
A
OE
A
† All typical values are at VCC = 3.3 V, TA = 25°C.
8
MIN
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2.1
5.3
2.1
5.3
0.3
5.7
0.3
5.7
ns
ns
SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001
PARAMETER MEASUREMENT INFORMATION
1.5 V
6V
500 Ω
From Output
Under Test
S1
Open
GND
CL = 50 pF
(see Note A)
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
500 Ω
25 Ω
From Output
Under Test
CL = 30 pF
(see Note A)
S1
Open
6V
GND
LOAD CIRCUIT FOR A OUTPUTS
Test
Point
LOAD CIRCUIT FOR B OUTPUTS
3V
1.5 V
Input
1.5 V
0V
tPLH
tPHL
VOH
1V
Output
1V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(A port to B port)
1V
0V
tPLH
1.5 V
1.5 V
0V
Output
Waveform 1
S1 at 6 V
(see Note B)
tPHL
tPLZ
3V
1.5 V
VOL + 0.3 V
VOL
tPHZ
tPZH
VOH
Output
1.5 V
tPZL
1.5 V
1V
Input
3V
Output
Control
1.5 V
VOL
Output
Waveform 2
S1 at GND
(see Note B)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(B port to A port)
1.5 V
VOH
VOH – 0.3 V
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
(A port)
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≈ 10 MHz, ZO = 50 Ω, tr ≈ 2 ns, tf ≈ 2 ns.
D. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
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• DALLAS, TEXAS 75265
9
SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001
DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS
The preceding switching characteristics table shows the switching characteristics of the device into a lumped load
(Figure 1). However, the designer’s backplane application probably is a distributed load. The physical representation
is shown in Figure 2. This backplane, or distributed load, can be approximated closely to a resistor inductance
capacitance (RLC) circuit, as shown in Figure 3. This device has been designed for optimum performance in this RLC
circuit. The following switching characteristics table shows the switching characteristics of the device into the RLC
load, to help the designer better understand the performance of the GTLP device in this typical backplane. See
www.ti.com/sc/gtlp for more information.
38 Ω
.25”
ZO = 70 Ω
2”
2”
.25”
38 Ω
1.5 V
1.5 V
1.5 V
Conn.
Conn.
1”
Conn.
1”
1”
Conn.
19 Ω
From Output
Under Test
1”
Rcvr
Rcvr
Rcvr
Slot 2
Slot 9
Slot 10
LL = 19 nH
CL = 9 pF
Drvr
Slot 1
Test
Point
Figure 2. Medium-Drive Test Backplane
Figure 3. Medium-Drive RLC Network
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, VTT = 1.5 V and VREF = 1 V for GTLP (see Figure 3)
PARAMETER
tPLH
tPHL
ten
tdis
tr
tf
FROM
(INPUT)
TO
(OUTPUT)
A
B
OE
B
4.3
4.3
5
4.4
UNIT
ns
ns
Rise time, B outputs (20% to 80%)
1
ns
Fall time, B outputs (80% to 20%)
2
ns
† All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI-SPICE models.
10
TYP†
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