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4 x 4 REGISTER FILE
OPEN-COLLECTOR
The TTL / MSI SN54 / 74LS170 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.
Open-collector outputs make it possible to connect up to 128 outputs in a
wired-AND configuration 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.
The SN54 / 74LS670 provides a similar function to this device but it features
3-state outputs.
Simultaneous Read/ Write Operation
Expandable to 512 Words of n-Bits
Typical Access Time of 20 ns
Low Leakage Open-Collector Outputs for Expansion
Typical Power Dissipation of 125 mW
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC D1 WA WB EW ER Q1 Q2
16 15 14 13 12 11 10 9
1 2 3 4 56 78
D2 D3 D4 RB RA Q4 Q3 GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES
LOADING (Note a)
HIGH
LOW
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.
1.0 U.L.
Open-Collector
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
0.5 U.L.
5 (2.5) U.L.
NOTES:
a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
b. Temperature Ranges. The Output HIGH drive must be supplied by an external resistor to VCC.
SN54/74LS170
4 x 4 REGISTER FILE
OPEN-COLLECTOR
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
12 15 1 2 3
14
13
WA EW
WB
D1 D2 D3 D4
5 RA
4 RB ER Q1 Q2 Q3 Q4
11 10 9 7 6
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
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12
EW
13
WB
WA 14
SN54 / 74LS170
LOGIC DIAGRAM
D4 D3
32
D2 D1
1 15
GD
Q
GD
Q
GD
Q
WORD
0
GD
Q
GD
Q
GD
Q
GD
Q
WORD
G D1
Q
GD
Q
GD
Q
GD
Q
WORD
G D2
Q
4
RB
GD
Q
11
ER
5
RA
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
6
Q4
GD
Q
7
Q3
GD
Q
9
Q2
WORD
G D3
Q
10
Q1
FAST AND LS TTL DATA
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SN54 / 74LS170
WRITE FUNCTION TABLE (SEE NOTES A, B, AND C)
WRITE INPUTS
WORD
WB WA EW
0
1
2
3
L L L Q = D Q0 Q0 Q0
L
H
L
Q0 Q = D Q0
Q0
H L L Q0 Q0 Q = D Q0
H H L Q0 Q0 Q0 Q = D
X X H Q0 Q0 Q0 Q0
READ FUNCTION TABLE (SEE NOTES A AND D)
READ INPUTS
OUTPUTS
RB RA ER
Q1
Q2
Q3
Q4
L L L W0B1 W0B2 W0B3 W0B4
L H L W1B1 W1B2 W1B3 W1B4
H L L W2B1 W2B2 W2B3 W2B4
H H L W3B1 W3B2 W3B3 W3B4
XXH
H
H
H
H
NOTES: A. H = HIGH Level. L = LOW Level, X = Irrelevant.
NOTES: B. (Q = D) = The four selected internal flip-flop outputs will assume the states applied to the four external data inputs.
NOTES: C. Q0 = the level of Q before the indicated input conditions were established.
NOTES: D. W0B1 = The first bit of word 0, etc.
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
VOH
IOL
Output Voltage — High
Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
5.5 V
54 4.0 mA
74 8.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
54
VIL Input LOW Voltage 74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
IOH
VOL
Input Clamp Diode Voltage
Output HIGH Current
54, 74
Output LOW Voltage
54, 74
74
– 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
100 µA VCC = MIN, VOH = MAX
0.25 0.4
0.35 0.5
V IOL = 4.0 mA VCC = VCC MIN,
VIN = VIL or VIH
V IOL = 8.0 mA per Truth Table
Input HIGH Current
Any D, R, W
IIH ER, EW
Any D, R, W
ER, EW
Input LOW Current
IIL Any D, R, W
ER, EW
ICC Power Supply Current
20 µA VCC = MAX, VIN = 2.4 V
40
0.1
0.2
mA VCC = MAX, VIN = 7.0 V
– 0.4 mA VCC = MAX, VIN = 0.4 V
– 0.8
40 mA VCC = MAX
FAST AND LS TTL DATA
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SN54 / 74LS170
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, Negative-
Going ER to Q Outputs
Propagation Delay, RA or RB
to Q Outputs
Propagation Delay, Negative-
Going EW to Q Outputs
Propagation Delay, Data Inputs
to Q Outputs
AC SETUP REQUIREMENTS (TA = 25°C)
Symbol
tW
ts
ts
th
th
tLATCH
Parameter
Pulse Width, ER, EW
Setup Time, Data to EW
Setup Time, WA, WB to EW
Hold Time, Data to EW
Hold Time, WA, WB to EW
Latch Time
Limits
Min Typ Max
20 30
20 30
25 40
24 40
30 45
26 40
30 45
22 35
Unit
ns
ns
ns
ns
Test Conditions
Figure 1
Figure 2
Figure 1
VCC = 5.0 V
CL = 15 pF
RL = 2.0 k
Figure 1
Limits
Min Typ Max
25
10
15
15
5.0
25
Unit
ns
ns
ns
ns
ns
ns
Test Conditions
VCC = 5.0 V
RL = 2.0 k
VOLTAGE WAVEFORMS
WRITE-SELECT
INPUT WA or WB
DATA INPUT
D1, D2, D3 or D4
WRITE-ENABLE
INPUT EW
READ-SELECT
INPUT RA or RB
READ-ENABLE
INPUT ER
OUTPUT
Q1, Q2, Q3 or Q4
Vref
tsu(W)
Vref
th(W)
Vref
tw
Vref
Vref
tsu(D)th(D)
Vref
tlatch
Vref
Vref
tW
Vref Vref
tPHL tPLH
Vref Vref
tPHL tPLH
3V
0V
3V
0V
3V
0V
3V
0V
3V
0V
VOH
VOL
Figure 1
DATA INPUT
D1, D2, D3 or D4
WRITE-ENABLE
INPUT EW
OUTPUT
Q1, Q2, Q3 or Q4
Vref
tPLH
Vref
DATA INPUT
D1, D2, D3 or D4
WRITE-ENABLE
INPUT EW
OUTPUT
Q1, Q2, Q3 or Q4
Vref
tPHL
Vref
Figure 2
Vref
tPHL
Vref
Vref
tPLH
Vref
3V
0V
3V
0V
VOH
VOL
3V
0V
3V
0V
3V
0V
FAST AND LS TTL DATA
5-4