From Output

Under Test

C = 45 pF

L

R = 667

L

W

VCC

SN74LS292, SN74LS294

www.ti.com

SDLS153A – JANUARY 1981 – REVISED JANUARY 2016

6.3 Thermal Information

SN74LS292

THERMAL METRIC(1)

N (PDIP)

UNIT

16 PINS

RθJA

Junction-to-ambient thermal resistance

36.8

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

22.2

°C/W

RθJB

Junction-to-board thermal resistance

17.0

°C/W

ψJT

Junction-to-top characterization parameter

7.0

°C/W

ψJB

Junction-to-board characterization parameter

16.8

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

6.4 Electrical Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS(1)

MIN

TYP(2)

MAX

UNIT

VIK

VCC = MIN, II = –18 mA

–1.5

V

VOH

Q

VCC = MIN, VIH = 2 V, IOH = –1.2 mA, VIL = MAX

2.4

3.4

V

IOL = 12 mA

0.25

0.4

Q

VOL

VCC = MIN, VIH = 2 V, VIL = MAX

IOL = 24 mA

0.35

0.5

V

TP(3)

IOL = 0.5 mA

0.25

0.4

II

VCC = MAX, VI = 7 V

0.1

mA

IIH

VCC = MAX, VI = 2.7 V

20

mA

CLK1, CLK2

VCC = MAX, VI = 0.4 V

–0.8

IIL

mA

All others

VCC = MAX, VI = 0.4 V

–0.4

IOS

(4)

Q

VCC = MAX

–30

–130

mA

SN74LS292

VCC = MAX, all inputs grounded, all outputs open

40

75

ICC

mA

SN74LS294

VCC = MAX, all inputs grounded, all outputs open

30

50

(1)

For conditions shown as MIN or MAX, use the appropriate value specified under Recommended Operating Conditions.

(2)

All typical values are at VCC = 5 V, TA = 25°C.

(3)

The TP output or outputs are not intended to drive external loads, but are solely provided for test points.

(4)

The duration of the short-circuit should not exceed one second.

6.5 Switching Characteristics

VCC = 5 V, TA = 25°C, RL = 667 Ω, CL = 45 pF (see Figure 1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fmax

From CLK1 or 2

30

50

MHz

From CLK1 or 2, to Q; Modulo set at 22, A through # = LLLHL

tPLH

55

90

ns

(xxxxLS292), A through D = LLHL (xxxxLS294)

From CLK1 or 2, to Q; Modulo set at 22, A through # = LLLHL

80

120

(xxxxLS292), A through D = LLHL (xxxxLS294)

tPHL

ns

SN74LS292

85

130

From CLR, to Q

SN74LS294

35

65

Figure 1. Switching Loads

Copyright © 1981–2016, Texas Instruments Incorporated

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