参数资料
型号: SNJ54HC148FKR
厂商: TEXAS INSTRUMENTS INC
元件分类: 算术逻辑单元
英文描述: HC/UH SERIES, 8-BIT ENCODER, INVERTED OUTPUT, CQCC20
封装: CERAMIC, LCC-20
文件页数: 18/21页
文件大小: 814K
代理商: SNJ54HC148FKR
SN54HC148, SN74HC148
8LINE TO 3LINE PRIORITY ENCODERS
SCLS109G MARCH 1984 REVISED APRIL 2004
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
operating characteristics, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load
35
pF
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
10%
90%
VCC
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
10%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
10%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
Test
Point
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
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. The outputs are measured one at a time, with one input transition per measurement.
D. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
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