Datasheet SN74ls170 Datasheet

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)

Q

V

D1WAWBE

CC

16 15

E

W

R

14 13 12 11 10 9

Q

1

2

SN54/74LS170

4 x 4 REGISTER FILE

OPEN-COLLECTOR

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

16

1

16

1

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.

123456

D3D4RBRAQ4Q3GND

D

2

PIN NAMES LOADING (Note a)

D1–D WA, W E

W

RA, R E

R

Q1–Q

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. T emperature Ranges. The Output HIGH drive must be supplied by an external resistor to VCC.

Data Inputs

4

Write Address Inputs

B

Write Enable (Active LOW) Input Read Address Inputs

B

Read Enable (Active LOW) Input Outputs (Note b)

4

7

8

HIGH

0.5 U.L.

1.0 U.L.

0.5 U.L.

1.0 U.L.

Open-Collector

LOW

0.25 U.L.

0.5 U.L.

0.25 U.L.

0.5 U.L.

5 (2.5) U.L.

D SUFFIX

16

1

SOIC

CASE 751B-03

ORDERING INFORMATION

SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXD SOIC

LOGIC SYMBOL

12 15 1 2 3

W

14 13

5 4

E

A

W

B

R

A

E

R

B

11 10 9 7 6

VCC = PIN 16 GND = PIN 8

D

1

Q1Q

D2D

2

3

D

4

Q4Q

FAST AND LS TTL DAT A

5-1

SN54/74LS170

LOGIC DIAGRAM

D

4

12

E

W

13

W

B

W

A

14

GD

Q

3

GD

Q

GD

Q

GD

Q

GD

Q

D

3

GD

Q

GD

DGD

Q

GD

Q

D

2

12

GD

Q

GD

Q

GD

Q

WORD

GD

Q

GD

Q

GD

Q

GD

Q

WORD

0

WORD

1

WORD

2

3

D

1

15

4

R

B

11

E

R

5

R

A

VCC = PIN 16 GND = PIN 8

= PIN NUMBERS

67

Q

4

Q

3

9

Q

2

10

Q

1

FAST AND LS TTL DATA

5-2

SN54/74LS170

VILI

LOW Volt

V

pg

VOLOutput LOW Volt

V

I

IH

WRITE FUNCTION TABLE (SEE NOTES A, B, AND C) READ FUNCTION TABLE (SEE NOTES A AND D)

WRITE INPUTS WORD READ INPUTS OUTPUTS

W

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. W

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

T

A

V

OH

I

OL

W

B

L L L Q=D Q L HLQ H LLQ H HLQ X XHQ

0B1

Supply Voltage 54

Operating Ambient Temperature Range 54

Output Voltage — High 54, 74 5.5 V Output Current — Low 54

E

A

W

= The first bit of word 0, etc.

0 1 2 3 R

0 0 0 0

Q

0

Q=D Q

Q

Q=D Q

0

Q Q

0 0

Q Q

R

B

Q

0 0

0

Q

0 0

Q=D H H L W3B1 W3B2 W3B3 W3B4

Q

0

L L L W0B1 W0B2 W0B3 W0B4 L H L W1B1 W1B2 W1B3 W1B4

H L L W2B1 W2B2 W2B3 W2B4

XXH H HHH

74

E

A

4.5

4.75 –55

0

Q

R

5.0

5.0 25

25

Q

1

2

5.5

5.25 125

70

4.0

8.0

Q

3

V

°C

mA

Q

4

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol Parameter

V

V I

I

IH

IK

OH

IH

IL

CC

Input HIGH Voltage 2.0 V

nput

Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA Output HIGH Current 54, 74 100 µA VCC = MIN, VOH = MAX

Input HIGH Current

Any D, R, W E

, E

R

Any D, R, W ER, E

Input LOW Current

Any D, R, W E

, E

R

Power Supply Current 40 mA VCC = MAX

age

W

54 0.7 74 0.8

54, 74 0.25 0.4 V IOL = 4.0 mA

74 0.35 0.5 V IOL = 8.0 mA

Min Typ Max

20 40

0.1

0.2

–0.4 –0.8

Unit Test Conditions

Guaranteed Input HIGH Voltage for All Inputs

Guaranteed Input LOW Voltage for All Inputs

µA VCC = MAX, VIN = 2.4 V

mA VCC = MAX, VIN = 7.0 V

mA VCC = MAX, VIN = 0.4 V

VCC = VCC MIN,

=

or

IN

IL

per Truth Table

IH

FAST AND LS TTL DATA

5-3

SN54/74LS170

C

F

CC

AC CHARACTERISTICS (T

Symbol Parameter

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

Propagation Delay, NegativeGoing E

Propagation Delay, RA or R to Q Outputs

Propagation Delay, NegativeGoing E

Propagation Delay , Data Inputs to Q Outputs

= 25°C)

A

to Q Outputs

R

to Q Outputs

W

AC SETUP REQUIREMENTS (T

Symbol Parameter

t

W

t

s

t

s

t

h

t

h

t

LATCH

Pulse Width, ER, E Setup Time, Data to E Setup Time, WA, WB to E Hold Time, Data to E Hold Time, WA, WB to E Latch Time 25 ns

= 25°C)

A

W

Limits

Min Typ Max

20 20

B

Min Typ Max

25 ns 10 ns

W

15 ns 15 ns

5.0 ns

25 24

30 26

30 22

Limits

Unit Test Conditions

30 30

40 40

45 40

45 35

ns Figure 1

ns Figure 2

ns Figure 1

Unit Test Conditions

VCC = 5.0 V

RL = 2.0 kΩ

= 15 p

L

RL = 2.0 kΩ

WRITE-SELECT INPUT WA or W

DATA INPUT D1, D2, D3 or D4

WRITE-ENABLE INPUT E

READ-SELECT INPUT RA or R

READ-ENABLE INPUT E

OUTPUT Q1, Q2, Q3 or Q4

B

W

B

R

VOLTAGE WAVEFORMS

t

PLH

V

t

PLH

ref

3 V 0 V 3 V 0 V

3 V 0 V V

OH

V

OL

V

ref

t

su(W)

t

w

V

ref

t

latch

V

ref

t

h(W)

V

ref

V

ref

t

PHL

t

su(D) V

ref

V

t

ref h(D)

V

ref

V

ref

t

W

V

ref

t

PHL V

ref

DATA INPUT D1, D2, D3 or D4

WRITE-ENABLE INPUT E

W

OUTPUT Q1, Q2, Q3 or Q4

DATA INPUT D1, D2, D3 or D4

WRITE-ENABLE INPUT E

W

OUTPUT Q1, Q2, Q3 or Q4

V

ref

t

PLH

V

ref

V

ref

t

PHL

V

ref

Figure 1 Figure 2

3 V

0 V 3 V

V

ref

t

PHL

V

ref

V

ref

t

PLH

V

ref

0 V

V

V 3 V

0 V 3 V

0 V

OH

OL

FAST AND LS TTL DATA

5-4