SN74ALVCH16373
16-BIT TRANSPARENT D-TYPE LATCH
WITH 3-STATE OUTPUTS
www.ti.com
SCES020I–JULY 1995–REVISED NOVEMBER 2005
FEATURES
DGG OR DL PACKAGE
(TOP VIEW)
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Member of the Texas Instruments Widebus™
Family
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1OE
1Q1
1Q2
GND
1Q3
1Q4
1LE
1D1
1D2
GND
1D3
1D4
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Operates From 1.65 V to 3.6 V
Max tpd of 3.6 ns at 3.3 V
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±24-mA Output Drive at 3.3 V
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Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors
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Latch-Up Performance Exceeds 250 mA Per
JESD 17
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V
CC
V
CC
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1Q5
1Q6
GND
1Q7
1Q8
2Q1
2Q2
GND
2Q3
2Q4
1D5
1D6
GND
1D7
1D8
2D1
2D2
GND
2D3
2D4
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ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
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DESCRIPTION/ORDERING INFORMATION
This 16-bit transparent D-type latch is designed for
1.65-V to 3.6-V VCC operation.
V
CC
V
CC
The SN74ALVCH16373 is particularly suitable for
implementing buffer registers, I/O ports, bidirectional
bus drivers, and working registers. This device can
be used as two 8-bit latches or one 16-bit latch.
When the latch-enable (LE) input is high, the Q
outputs follow the data (D) inputs. When LE is taken
low, the Q outputs are latched at the levels set up at
the D inputs.
2Q5
2Q6
GND
2Q7
2Q8
2OE
2D5
2D6
GND
2D7
2D8
2LE
A buffered output-enable (OE) input can be used to
place the eight outputs in either a normal logic state
(high or low logic levels) or the high-impedance state.
In the high-impedance state, the outputs neither
load nor drive the buslines significantly. The
high-impedance state and the increased drive provide
the capability to drive bus lines without need for
interface or pullup components. OE does not affect
internal operations of the latch. Old data can be
retained or new data can be entered while the
outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
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.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 1995–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.