SN74LS670
4 x 4 Register File
with 3-State Outputs
The TTL / MSI SN74LS670 is a high-speed, low-power 4 x 4
Register File organized as four words by four bits. Separate read and
write inputs, both address and enable, allow simultaneous read and
write operation.
The 3-state outputs make it possible to connect up to 128 outputs to
increase the word capacity up to 512 words. Any number of these
devices can be operated in parallel to generate an n-bit length.
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Simultaneous Read / Write Operation
Expandable to 512 Words by n-Bits
Typical Access Time to 20 ns
3-State Outputs for Expansion
Typical Power Dissipation of 125 mW
LOW
POWER
SCHOTTKY
GUARANTEED OPERATING RANGES
Symbol
V
CC
T
A
I
OH
I
OL
Parameter
Supply Voltage
Operating Ambient
Temperature Range
Output Current – High
Output Current – Low
Min
4.75
0
Typ
5.0
25
Max
5.25
70
– 2.6
24
Unit
V
°C
mA
mA
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
SN74LS670N
SN74LS670D
Package
16 Pin DIP
16 Pin
Shipping
2000 Units/Box
2500/Tape & Reel
©
Semiconductor Components Industries, LLC, 1999
1
December, 1999 – Rev. 6
Publication Order Number:
SN74LS670/D
SN74LS670
CONNECTION DIAGRAM DIP
(TOP VIEW)
V
CC
16
D
1
15
W
A
14
W
B
13
E
W
12
E
R
11
Q
1
10
Q
2
9
NOTE:
The Flatpak version has the same
pinouts (Connection Diagram) as
the Dual In-Line Package.
1
D
2
2
D
3
3
D
4
4
R
B
5
R
A
6
Q
4
7
Q
3
8
GND
LOADING
(Note a)
PIN NAMES
D
1
– D
4
W
A
, W
B
E
W
R
A
, R
B
E
R
Q
1
– Q
4
Data Inputs
Write Address Inputs
Write Enable (Active LOW) Input
Read Address Inputs
Read Enable (Active LOW) Input
Outputs
HIGH
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.5 U.L.
1.5 U.L.
65 U.L.
LOW
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.75 U.L.
15 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
m
A HIGH/1.6 mA LOW.
LOGIC SYMBOL
12
14
13
5
4
W
A
E
W
W
B
R
A
R
B
E
R
11
15 1 2 3
D
1
D
2
D
3
D
4
Q
1
Q
2
Q
3
Q
4
10 9 7
6
V
CC
= PIN 16
GND = PIN 8
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2
SN74LS670
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
V
IH
V
IL
V
IK
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
2.4
– 0.65
3.1
0.25
V
O
OL
I
OZH
I
OZL
Output LOW Voltage
0.35
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
D, R, W
E
W
E
R
D, R, W
E
W
E
R
Input LOW Current
D, R, W
E
W
E
R
Short Circuit Current (Note 1)
Power Supply Current
– 30
0.5
20
–20
20
40
60
0.1
0.2
0.3
– 0.4
– 0.8
–1.2
– 130
50
V
µA
µA
µA
I
OL
= 24 mA
0.4
Min
2.0
0.8
– 1.5
Typ
Max
Unit
V
V
V
V
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
V
CC
= MIN, I
IN
= – 18 mA
V
CC
= MIN, I
OH
= MAX, V
IN
= V
IH
or V
IL
per Truth Table
I
OL
= 12 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
per Truth Table
V
CC
= MAX, V
O
= 2.7 V
V
CC
= MAX, V
O
= 0.4 V
V
CC
= MAX, V
IN
= 2.7 V
I
IH
mA
V
CC
= MAX, V
IN
= 7.0 V
I
IL
mA
V
CC
= MAX, V
IN
= 0.4 V
I
OS
I
CC
mA
mA
V
CC
= MAX
V
CC
= MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
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4
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