SN54/74LS670
4 x 4 REGISTER FILE
WITH 3-STATE OUTPUTS
The TTL / MSI SN54 / 74LS670 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 in-
crease the word capacity up to 512 words. Any number of these devices can
be operated in parallel to generate an n-bit length.
The SN54 / 74LS170 provides a similar function to this device but it features
open-collector outputs.
4 x 4 REGISTER FILE
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
•
•
•
•
•
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
J SUFFIX
CERAMIC
CASE 620-09
16
1
CONNECTION DIAGRAM DIP
(TOP VIEW)
VCC
16
D1
15
WA
14
WB
13
EW
12
ER
11
Q1
10
Q2
9
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
1
D2
2
D3
3
D4
4
RB
5
RA
6
Q4
7
Q3
8
GND
ORDERING INFORMATION
PIN NAMES
LOADING (Note a)
HIGH
D1 – D4
WA, WB
EW
RA, RB
ER
Q1 – Q4
Data Inputs
Write Address Inputs
Write Enable (Active LOW) Input
Read Address Inputs
Read Enable (Active LOW) Input
Outputs (Note b)
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.5 U.L.
1.5 U.L.
65 (25) U.L.
LOW
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.75 U.L.
15 (7.5) U.L.
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
12
14
13
5
4
WA EW
WB
RA
RB E
R
11
15 1
2
3
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
µA
HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial
(74) Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military and
65 U.L. for Commercial Temperature Ranges.
D1 D2 D3 D4
Q1 Q2 Q3 Q4
10 9 7
6
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
5-597
SN54/74LS670
LOGIC DIAGRAM
D4
EW
WB
WA
WORD
0
12
3
D3
2
D2
1
D1
15
13
14
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
G
Q
D
WORD
1
G
Q
D
G
Q
D
G
Q
D
G
Q
D
WORD
2
WORD
3
G
Q
4
D
G
Q
D
G
Q
D
G
Q
D
RB
11
ER
RA
5
6
7
9
10
Q4
Q3
Q2
Q1
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
FAST AND LS TTL DATA
5-598
SN54/74LS670
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
Parameter
54
74
54
74
54
74
54
74
Min
4.5
4.75
– 55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
–1.0
–2.6
12
24
Unit
V
°C
mA
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VIK
VOH
Parameter
Input HIGH Voltage
54
Input LOW Voltage
74
Input Clamp Diode Voltage
54
Output HIGH Voltage
74
54, 74
VOL
IOZH
IOZL
Output LOW Voltage
74
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
D, R, W
EW
ER
D, R, W
EW
ER
Input LOW Current
D, R, W
EW
ER
Short Circuit Current (Note 1)
Power Supply Current
– 30
0.35
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
2.4
3.1
0.25
0.4
V
V
2.4
– 0.65
3.4
0.8
– 1.5
V
V
Min
2.0
0.7
V
Typ
Max
Unit
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
IOL = 12 mA
IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VO = 2.7 V
VCC = MAX, VO = 0.4 V
VCC = MAX, VIN = 2.7 V
IIH
mA
VCC = MAX, VIN = 7.0 V
IIL
mA
VCC = MAX, VIN = 0.4 V
IOS
ICC
mA
mA
VCC = MAX
VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-599
SN54/74LS670
AC CHARACTERISTICS
(TA = 25°C)
Limits
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPLZ
tPHZ
Parameter
Propagation Delay, RA or RB
to Output
Propagation Delay, EW to
Output
Propagation Delay, Data
to Output
Output Enable Time
Output Disable Time
Min
Typ
23
25
26
28
25
23
15
22
16
30
Max
40
45
45
50
45
40
35
40
35
50
Unit
ns
ns
ns
ns
ns
CL = 5.0 pF
Test Conditions
VCC = 5.0 V,
CL = 45 pF
AC SETUP REQUIREMENTS
(TA = 25°C)
Limits
Symbol
tW
ts
ts
th
th
trec
Pulse Width
Setup Time, (D)
Setup Time, (W)
Hold Time, (D)
Hold Time, (W)
Recovery Time
Parameter
Min
25
10
15
15
5.0
25
Typ
Max
Unit
ns
ns
ns
ns
ns
ns
VCC = 5.0 V
Test Conditions
AC WAVEFORMS
D, E
W
1.3 V
1.3 V
R , R
A
B
1.3 V
1.3 V
t
PHL
t
PLH
t
PHL
t
PLH
Q
1.3 V
1.3 V
Q
1.3 V
1.3 V
Figure 1
Figure 2
W , W
A
B
1.3 V
1.3 V
t
s
t
h
1.3 V
D
1.3 V
t
W
1.3 V
E
W
t
s
t
h
1.3 V
Figure 3
FAST AND LS TTL DATA
5-600
-A-
Case 751B-03 D Suffix
16-Pin Plastic
SO-16
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
3.
CONTROLLING DIMENSION: MILLIMETER.
DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4.
MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5.
751B 01 IS OBSOLETE, NEW STANDARD
751B 03.
16
9
-B-
1
8
P
8 PL
0.25 (0.010)
M
B
M
R X 45°
G
-T-
D
16 PL
0.25 (0.010)
M
C
SEATING
PLANE
K
T
B
S
M
F
J
A
S
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
9.80
3.80
1.35
0.35
0.40
10.00
4.00
1.75
0.49
1.25
INCHES
MIN
MAX
0.386
0.150
0.054
0.014
0.016
0.393
0.157
0.068
0.019
0.049
1.27 BSC
0.19
0.10
0
0.25
0.25
7
0.050 BSC
0.008
0.004
0
0.009
0.009
7
°
°
°
°
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
Case 648-08 N Suffix
16-Pin Plastic
-A-
16
9
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
3.
CONTROLLING DIMENSION: INCH.
DIMENSION L" TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4.
DIMENSION B" DOES NOT INCLUDE MOLD
FLASH.
5.
6.
ROUNDED CORNERS OPTIONAL.
648 01 THRU 07 OBSOLETE, NEW STANDARD
648 08.
B
1
8
F
S
C
-T-
K
SEATING
PLANE
L
H
G
D
16 PL
0.25 (0.010)
M
J
M
T
A
M
DIM
A
B
C
D
F
G
H
J
K
L
M
S
MILLIMETERS
MIN
MAX
18.80
6.35
3.69
0.39
1.02
19.55
6.85
4.44
0.53
1.77
INCHES
MIN
MAX
0.740
0.250
0.145
0.015
0.040
0.770
0.270
0.175
0.021
0.070
2.54 BSC
1.27 BSC
0.21
2.80
7.50
0
0.38
3.30
7.74
10
0.100 BSC
0.050 BSC
0.008
0.110
0.295
0
0.015
0.130
0.305
10
°
°
°
°
0.51
1.01
0.020
0.040
-A-
16
9
Case 620-09 J Suffix
16-Pin Ceramic Dual In-Line
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
-B-
1
8
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIM F MAY NARROW TO 0.76 (0.030) WHERE
THE LEAD ENTERS THE CERAMIC BODY.
C
L
5. 620 01 THRU 08 OBSOLETE, NEW STANDARD
620 09.
-T-
SEATING
PLANE
K
E
F
D
16 PL
0.25 (0.010)
M
N
G
T
A
S
M
J
16 PL
0.25 (0.010)
M
T
B
S
DIM
A
B
C
D
E
F
G
J
K
L
M
N
MILLIMETERS
MIN
MAX
19.05
6.10
19.55
7.36
4.19
0.39
0.53
INCHES
MIN
MAX
0.750
0.240
0.770
0.290
0.165
0.015
0.021
1.27 BSC
1.40
1.77
0.050 BSC
0.055
0.070
2.54 BSC
0.23
0.27
5.08
7.62 BSC
0
0.100 BSC
0.009
0.011
0.200
0.300 BSC
0
°
15
°
°
15
°
0.39
0.88
0.015
0.035
FAST AND LS TTL DATA
5-601
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