參數(shù)資料
型號(hào): MC74HC195N
廠商: MOTOROLA INC
元件分類(lèi): 通用總線(xiàn)功能
英文描述: 4-Bit Universal Shift Register
中文描述: HC/UH SERIES, 4-BIT RIGHT PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PDIP16
封裝: PLASTIC, DIP-16
文件頁(yè)數(shù): 4/7頁(yè)
文件大?。?/td> 203K
代理商: MC74HC195N
MC74HC195
MOTOROLA
High–Speed CMOS Logic Data
DL129 — Rev 6
3–4
PIN DESCRIPTION
DATA INPUTS
A, B, C, D (Pins 4, 5, 6, 7)
Parallel data inputs.
OUTPUTS
QA, QB, QC, QD, QD (Pins 15, 14, 13, 12, 11)
Parallel data outputs.
CONTROL INPUTS
Clock (Pin 10)
Clock input. The shift register is completely static, allowing
Clock rates down to DC in a continuous or intermittent mode.
Serial Shift/Parallel Load (Pin 9)
Shift or load control. A low level applied to this pin allows
data to be loaded from the parallel inputs. Data is loaded with
the positive transition of the Clock input. A high level allows
data to be shifted in the manner dictated by the J and K con-
trol inputs.
Reset (Pin 1)
A low level applied to this pin resets all stages and forces
all outputs low.
J, K (Pins 2, 3)
Shift Control. With Serial Shift/Parallel Load high, J and K
control the mode of operation, as illustrated in the Function
Table.
J = L, K = H
With a positive transition of the Clock input, each bit is
shifted to the right (in the direction QA toward QD) one stage
and stage A maintains its previous state.
J = H, K = L
With a positive transition of the Clock input, each bit is
shifted right (in the direction of QA toward QD) one stage and
the QA output is inverted.
J = K = L
With a positive transition of the Clock input, each bit is
shifted right (in the direction QA toward QD) one stage and a
low is loaded into stage A.
J = K = H
With a positive transition of the Clock input, each bit is
shifted right (in the direction QA toward QD) one stage and a
high is loaded into stage A.
SWITCHING WAVEFORMS
Figure 1.
CLOCK
Q
tr
tf
VCC
GND
90%
50%
10%
90%
50%
10%
tPLH
tPHL
tTLH
tTHL
50%
INPUT
A, B, C,
D, J, OR K
CLOCK
VCC
Figure 2.
VALID
GND
Figure 3.
tw
1/fmax
VCC
GND
tsu
th
50%
Figure 4.
GND
GND
RESET
Q
Q
CLOCK
tPLH
tPHL
trec
tw
VCC
VCC
50%
50%
50%
50%
50%
SERIAL SHIFT
PARALLEL LOAD
CLOCK
VCC
VALID
GND
VCC
GND
tsu
th
50%
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