74hct670 NXP Semiconductors, 74hct670 Datasheet - Page 3

• Manufacturer Part Number: 74hct670
• Description: 4 X 4 Register File; 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PIN DESCRIPTION
WRITE MODE SELECT TABLE
Note
1. The write address (W
December 1990
PIN NO.
5, 4
8
10, 9, 7, 6
11
12
14, 13
15, 1, 2, 3
16
OPERATING
MODE
write data
data latched
4 x 4 register file; 3-state
“internal latches” must be stable while WE is
LOW for conventional operation.
Fig.2 Logic symbol.
SYMBOL
R
GND
Q
RE
WE
W
D
V
A
0
CC
0
A
, R
, W
to D
to Q
L
L
H
WE
B
INPUTS
B
3
3
L
H
X
A
D
and W
n
NAME AND FUNCTION
read address inputs
ground (0 V)
data outputs
3-state output read enable input (active LOW)
write enable input (active LOW)
write address inputs
data inputs
positive supply voltage
INTERNAL
LATCHES
L
H
no change
B
) to the
(1)
Fig.3 IEC logic symbol.
READ MODE SELECT TABLE
Notes
1. The selection of the “internal latches” by read address
OPERATING
MODE
read
disabled
(R
H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
3
A
and R
B
) are not constrained by WE or RE operation.
RE
H
L
L
INTERNAL LATCHES
INPUTS
Fig.4 Functional diagram.
Fig.1 Pin configuration.
H
X
L
74HC/HCT670
Product specification
(1)
OUTPUT
Q
H
L
Z
n