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參數(shù)資料
| 型號(hào)： | MC74F168 |
| 廠商： | Motorola, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-STAGE SYNCHRONOUS BIDIRECTIONAL COUNTERS FAST SCHOTTKY TTL |
| 中文描述： | 4級(jí)雙向計(jì)數(shù)器同步快速肖特基TTL |
| 文件頁(yè)數(shù)： | 3/4頁(yè) |
| 文件大?。?/td> | 119K |
| 代理商： | MC74F168 |
4-84
FAST AND LS TTL DATA
MC54/74F168
MC54/74F169
FUNCTIONAL DESCRIPTION
The F168 and F169 use edge-triggered J-K type flip-flops
and have no constraints on changing the control or data input
signals in either state of the clock. The only requirement is that
the various inputs attain the desired state at least a setup time
before the rising edge of the clock and remain valid for the rec-
ommended hold time thereafter. The parallel load operation
takes precedence over other operations, as indicated in the
Mode Select Table. When PE is LOW, the data on the P0-P3
inputs enters the flip-flops on the next rising edge of the clock.
In order for counting to occur, both CEP and CET must be
LOW and PE must be HIGH; the U/D input then determines
the direction of counting. The Terminal Count (TC) output is
normally HIGH and goes LOW, provided that CET is LOW,
when a counter reaches zero in the Count Down mode or
reaches 9 (15 for the F169) in the Count Up mode. The TC
output state is not a function of the Count Enable Parallel
(CEP) input level. The TC output of the F168 decade counter
can also be LOW in the illegal states 11, 13, and 15, which can
occur when power is turned on or via parallel loading. If an ille-
gal state occurs, the F168 will return to the legitimate se-
quence within two counts. Since the TC signal is derived by
decoding the flip-flop states, there exists the possibility of de-
coding spikes on TC. For this reason the use of TC as a clock
signal is not recommended (see logic equations below).
1) Count Enable = CEP
CET
PE
2) Up: (
′
F168): TC = Q0
Q1
Q2
Q3
(Up)
CET
(
′
F169): TC = Q0
Q1
Q2
Q3
(Up)
CET
3) Down: TC = Q0
Q1
Q2
Q3
(Down)
CET
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54, 74
4.5
5.0
5.5
V
TA
Operating Ambient Temperature Range
54
–55
25
125
°
C
74
0
25
70
IOH
Output Current — High
54, 74
–1.0
mA
IOL
Output Current — Low
54, 74
20
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
Input Clamp Diode Voltage
–1.2
V
VCC = MIN, IIN = – 18 mA
VOH
Output HIGH Voltage
54, 74
2.5
3.4
V
IOH = – 1.0 mA
VCC = 4.50 V
74
2.7
3.4
V
IOH = – 1.0 mA
VCC = 4.75 V
VOL
Output LOW Voltage
0.35
0.5
V
IOL = 20 mA
VCC = MIN
IIH
Input HIGH Current
20
μ
A
VCC = MAX, VIN = 2.7 V
0.1
mA
VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
CET
Other Inputs
–1.2
–0.6
mA
VCC = MAX, VIN = 0.5 V
IOS
Output Short Circuit Current (Note 2)
–60
–150
mA
VCC= MAX, VOUT = 0 V
ICC
Power Supply Current
52
mA
VCC = MAX
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
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