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SN74LVTH16501DGGR Datasheet(PDF) 2 Page - Texas Instruments

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Part # SN74LVTH16501DGGR
Description  3.3-V ABT 18-BIT UNIVERSAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN74LVTH16501DGGR Datasheet(HTML) 2 Page - Texas Instruments

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SN54LVTH16501, SN74LVTH16501
3.3-V ABT 18-BIT UNIVERSAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS700E – JULY 1997 – REVISED NOVEMBER 2002
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
Data flow in each direction is controlled by output-enable (OEAB and OEBA), latch-enable (LEAB and LEBA),
and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the devices operate in the transparent mode when
LEAB is high. When LEAB is low, the A data is latched if CLKAB is held at a high or low logic level. If LEAB is
low, the A data is stored in the latch/flip-flop on the low-to-high transition of CLKAB. When OEAB is high, the
outputs are active. When OEAB is low, the outputs are in the high-impedance state.
Data flow for B to A is similar to that of A to B but uses OEBA, LEBA, and CLKBA. The output enables are
complementary (OEAB is active high and OEBA is active low).
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.
When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, OE should be tied to VCC through a pullup resistor
and OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by
the current-sinking/current-sourcing capability of the driver.
These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry
disables the outputs, preventing damaging current backflow through the devices when they are powered down.
The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.
FUNCTION TABLE†
INPUTS
OUTPUT
OEAB
LEAB
CLKAB
A
B
L
X
X
X
Z
H
HX
L
L
H
HX
H
H
H
L
LL
H
L
HH
H
LH
X
B0‡
H
L
L
X
B0§
† A-to-B data flow is shown; B-to-A flow is similar, but
uses OEBA, LEBA, and CLKBA.
‡ Output level before the indicated steady-state input
conditions were established, provided that CLKAB
was high before LEAB went low
§ Output level before the indicated steady-state input
conditions were established


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