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参数资料
| 型号： | SN54HC191W |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 300mA, 2.5V +/-1% Output Voltage, Low Dropout Voltage Regulator, Pb-Free Device; Package: SOT-223 (TO-261) 4 LEAD; No of Pins: 4; Container: Tape and Reel; Qty per Container: 4000 |
| 中文描述： | 4位同步向上/向下二进制计数器 |
| 文件页数： | 9/10页 |
| 文件大小： | 156K |
| 代理商： | SN54HC191W |
SN54HC191, SN74HC191
4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS
SCLS121B – DECEMBER 1982 – REVISED MAY 1997
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
th
tsu
50%
50%
10%
50%
10%
90%
90%
VCC
VCC
0 V
0 V
tr
tf
Reference
Input
Data
Input
50%
High-Level
Pulse
50%
VCC
0 V
50%
50%
VCC
0 V
tw
Low-Level
Pulse
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
10%
50%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
10%
50%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
NOTES: A. CL includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR
≤
1 MHz, ZO = 50
, tr = 6 ns, tf = 6 ns.
C. For clock inputs, fmax is measured when the input duty cycle is 50%.
D. The outputs are measured one at a time with one input transition per measurement.
E. tPLH and tPHL are the same as tpd.
Test
Point
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
Figure 1. Load Circuit and Voltage Waveforms
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