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SN74GTLPH32945KR Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części SN74GTLPH32945KR
Szczegółowy opis  32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

SN74GTLPH32945KR Arkusz danych(HTML) 6 Page - Texas Instruments

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Recommended Operating Conditions
(1) (2) (3) (4)
SN74GTLPH32945
32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES293C – OCTOBER 1999 – REVISED JUNE 2005
MIN
NOM
MAX
UNIT
VCC,
Supply voltage
3.15
3.3
3.45
V
BIAS VCC
GTL
1.14
1.2
1.26
VTT
Termination voltage
V
GTLP
1.35
1.5
1.65
GTL
0.74
0.8
0.87
VREF
Reference voltage
V
GTLP
0.87
1
1.1
B port
VTT
VI
Input voltage
V
Except B port
VCC
5.5
B port
VREF + 0.05
VIH
High-level input voltage
V
Except B port
2
B port
VREF – 0.05
VIL
Low-level input voltage
V
Except B port
0.8
IIK
Input clamp current
–18
mA
IOH
High-level output current
A port
–24
mA
A port
24
IOL
Low-level output current
mA
B port
50
∆t/∆v
Input transition rise or fall rate
Outputs enabled
10
ns/V
∆t/∆V
CC
Power-up ramp rate
20
µs/V
TA
Operating free-air temperature
–40
85
°C
(1)
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.
(2)
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.
(3)
VTT and RTT can be adjusted to accommodate backplane impedances if the dc recommended IOL ratings are not exceeded.
(4)
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.
6


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