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74HCT5555D Datasheet(数据表) 6 Page - NXP Semiconductors

部件型号  74HCT5555D
说明  Programmable delay timer with oscillator
下载  23 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 

 6 page
background image
September 1993
6
Philips Semiconductors
Product specification
Programmable delay timer with oscillator
74HC/HCT5555
TEST MODE
Set S3 to a logic LOW level, this will divide the 24 stage counter into three, parallel clocking, 8-stage counters. Set S0,
S1 and S2 to a logic HIGH level, this programs the counter to divide-by 28 (256). Apply a trigger pulse and clock in 255
pulses, this sets all flip-flop stages to a logic HIGH level. Set S3 to a logic HIGH level, this causes the counter to divide-by
224. Clock one more pulse into the RS input, this causes a logic 0 to ripple through the counter and output Q/Q goes from
HIGH-to-LOW level. This method of testing the delay counter is faster than clocking in 224 (16 777 216) clock pulses.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don't care
↑ = LOW-to-HIGH transition
↓ = HIGH-to-LOW transition.
INPUTS
OUTPUTS
MR
A
BQ
Q
HX
X
L
H
L
X
one HIGH level
output pulse
one LOW level
output pulse
LX
one HIGH level
output pulse
one LOW level
output pulse




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