Datasheet

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  
  
SCES622 – JANUARY 2005
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description/ordering information (continued)
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry prevents damaging
current backflow through the device when it is powered down. The device has isolation during power off.
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.
FUNCTION TABLE
(each 8-bit bus switch)
INPUT
INPUT/OUTPUT
FUNCTION
INPUT
OE
INPUT/OUTPUT
A
FUNCTION
L B A port = B port
H Z Disconnect
terminal assignments
123456
A 1B2
1B1 NC 1OE 1A1 1A2
B 1B4 1B3 GND GND 1A3 1A4
C 1B6 1B5 V
CC
V
CC
1A5 1A6
D 1B8 1B7 GND GND 1A7 1A8
E 2B2 2B1 GND GND 2A1 2A2
F 2B4 2B3 V
CC
V
CC
2A3 2A4
G 2B6 2B5 GND GND 2A5 2A6
H 2B7 2B8 NC 2OE 2A8 2A7
J 3B2 3B1 NC 3OE 3A1 3A2
K 3B4 3B3 GND GND 3A3 3A4
L 3B6 3B5 V
CC
V
CC
3A5 3A6
M 3B8 3B7 GND GND 3A7 3A8
N 4B2 4B1 GND GND 4A1 4A2
P 4B4 4B3 V
CC
V
CC
4A3 4A4
R 4B6 4B5 GND GND 4A5 4A6
T 4B7 4B8 NC 4OE 4A8 4A7
NC − No internal connection
GKE PACKAGE
(TOP VIEW)
123456
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T