74HC193D datasheet(21/29 Pages) NXP

21 / 29 page

74HC_HCT193_3

Product data sheet

Rev. 03 — 23 May 2007

21 of 29

NXP Semiconductors

74HC193; 74HCT193

Presettable synchronous 4-bit binary up/down counter

Table 10.

Measurement points

Type

Input

Output

74HC193

0.5

× V

GND to VCC

0.5

× V

74HCT193

1.3 V

GND to 3 V

1.3 V

Test data is given in Table 11.

Deﬁnitions test circuit:

RT = Termination resistance should be equal to output impedance Zo of the pulse generator

CL = Load capacitance including jig and probe capacitance

RL = Load resistor

S1 = Test selection switch

Fig 16. Load circuitry for measuring switching times

10 %

90 %

0 V

negative

pulse

positive

pulse

0 V

90 %

10 %

001aad983

DUT

VCC

open

PULSE

GENERATOR

Table 11.

Test data

Type

Input

Load

S1 position

tr, tf

tPHL, tPLH

74HC193

VCC

6 ns

15 pF, 50 pF

1 k

Ω

open

74HCT193

3 V

6 ns

15 pF, 50 pF

1 k

Ω

open

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