SN74ALVCH16834
18-BIT UNIVERSAL BUS DRIVER
WITH 3-STATE OUTPUTS
SCES190 – FEBRUARY 1999
DGG, DGV, OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
1
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
NC
NC
Y1
GND
Y2
Y3
GND
NC
A1
GND
A2
A3
2
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
3
4
5
Package Options Include Plastic Shrink
Small-Outline (DL), Thin Shrink
Small-Outline (DGG), and Thin Very
Small-Outline (DGV) Packages
6
7
V
V
CC
Y4
CC
8
A4
A5
A6
GND
A7
9
Y5
Y6
GND
Y7
Y8
Y9
Y10
Y11
Y12
GND
Y13
Y14
Y15
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
description
This 18-bit universal bus driver is designed for
1.65-V to 3.6-V V operation.
A8
A9
CC
Data flow from A to Y is controlled by the
output-enable (OE) input. The device operates in
the transparent mode when the latch-enable (LE)
inputislow. TheAdataislatchediftheclock(CLK)
input is held at a high or low logic level. If LE is
high, the A data is stored in the latch/flip-flop on
the low-to-high transition of CLK. When OE is
high, the outputs are in the high-impedance state.
A10
A11
A12
GND
A13
A14
A15
V
V
CC
CC
Y16
Y17
GND
Y18
OE
A16
A17
GND
A18
CLK
GND
To ensure the high-impedance state during power
up or power down, OE should be tied to V
CC
through a pullup resistor; the minimum value of
the resistor is determined by the current-sinking
capability of the driver.
LE
Active bus-hold circuitry is provided to hold
unused or floating data inputs at a valid logic level.
NC – No internal connection
The SN74ALVCH16834 is characterized for
operation from –40°C to 85°C.
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.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
Copyright 1999, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265