74HCT193DB 查看數據表（PDF） - Philips Electronics

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74HCT193DB

Presettable synchronous 4-bit binary up/down counter

Philips Electronics 

Philips Semiconductors

Presettable synchronous 4-bit binary

up/down counter

Product specification

74HC/HCT193

FUNCTION TABLE

OPERATING MODE

reset (clear)

parallel load

count up

count down

INPUTS

OUTPUTS

MR PL CPU CPD D0 D1 D2 D3 Q0 Q1 Q2 Q3 TCU TCD

H X X L XXX X L

H X X H XXX X L

L L LH L

L L LH H

L L X L LLL L L

L L X H LLL L L

L L L X HHH H H

L L H X HHH H H

L L LH L

L L LH H

H H HL H

H H HH H

L H ↑ H XXX X

count up

H(2) H

L H H ↑ XXX X

count down

H

H(3)

Notes

1. H = HIGH voltage level

L = LOW voltage level

X = don’t care

↑ = LOW-to-HIGH clock transition

2. TCU = CPU at terminal count up (HHHH)

3. TCD = CPD at terminal count down (LLLL)

Fig.4 Functional diagram.

December 1990

5

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