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SN54AS867, SN54AS869
SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869
SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995
•
•
•
•
•
Fully Programmable With Synchronous
Counting and Loading
SN74ALS867A and
′AS867
Have
Asynchronous Clear; SN74ALS869 and
′AS869
Have Synchronous Clear
Fully Independent Clock Circuit
Simplifies Use
Ripple-Carry Output for n-Bit Cascading
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs
SN54AS867, SN54AS869 . . . JT PACKAGE
SN74ALS867A, SN74ALS869, SN74AS867,
SN74AS869 . . . DW OR NT PACKAGE
(TOP VIEW)
description
These synchronous, presettable, 8-bit up/down
counters feature internal-carry look-ahead
circuitry for cascading in high-speed counting
applications. Synchronous operation is provided
by having all flip-flops clocked simultaneously so
that the outputs change coincidentally with each
other when so instructed by the count-enable
(ENP, ENT) inputs and internal gating. This mode
of operation eliminates the output counting spikes
normally associated with asynchronous (ripple-
clock) counters. A buffered clock (CLK) input
triggers the eight flip-flops on the rising (positive-
going) edge of the clock waveform.
These counters are fully programmable; they may
be preset to any number between 0 and 255. The
load-input circuitry allows parallel loading of the
cascaded counters. Because loading is
synchronous, selecting the load mode disables
the counter and causes the outputs to agree with
the data inputs after the next clock pulse.
S0
S1
A
B
C
D
E
F
G
H
ENT
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
ENP
Q
A
Q
B
Q
C
Q
D
Q
E
Q
F
Q
G
Q
H
CLK
RCO
SN54AS867, SN54AS869 . . . FK PACKAGE
(TOP VIEW)
B
C
D
NC
E
F
G
4
5
6
7
8
9
10
3
2 1 28 27 26
25
24
23
22
21
20
ENP
Q
A
Q
B
Q
C
Q
D
NC
Q
E
Q
F
Q
G
19
11
12 13 14 15 16 17 18
NC – No internal connection
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without
additional gating. Two count-enable (ENP and ENT) inputs and a ripple-carry (RCO) output are instrumental
in accomplishing this function. Both ENP and ENT must be low to count. The direction of the count is determined
by the levels of the select (S0, S1) inputs as shown in the function table. ENT is fed forward to enable RCO. RCO
thus enabled produces a low-level pulse while the count is zero (all outputs low) counting down or 255 counting
up (all outputs high). This low-level overflow-carry pulse can be used to enable successive cascaded stages.
Transitions at ENP and ENT are allowed regardless of the level of CLK. All inputs are diode clamped to minimize
transmission-line effects, thereby simplifying system design.
These counters feature a fully independent clock circuit. With the exception of the asynchronous clear on the
SN74ALS867A and
′AS867,
changes at S0 and S1 that modify the operating mode have no effect on the Q
outputs until clocking occurs. For the
′AS867
and
′AS869,
any time ENP and/or ENT is taken high, RCO either
goes or remains high. For the SN74ALS867A and SN74ALS869, any time ENT is taken high, RCO either goes
or remains high. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely
by the conditions meeting the stable setup and hold times.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
H
ENT
GND
NC
RCO
CLK
Q
H
Copyright
©
1995, Texas Instruments Incorporated
A
S1
S0
NC
V
CC
1
模拟电子
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