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參數(shù)資料
| 型號(hào)： | SN54HC251FK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 300kHz Switching Regulator with 700V / 1.5A Switch and 500V Maximum Startup; Package: SOIC Wide 16 Minus Pins 2, 14, 15; No of Pins: 13; Container: Rail; Qty per Container: 47 |
| 中文描述： | 數(shù)據(jù)選擇器/多路復(fù)用3態(tài)輸出 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 492K |
| 代理商： | SN54HC251FK |
SCLS132E DECEMBER 1982 REVISED SEPTEMBER 2003
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
50%
10%
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
10%
50%
10%
90%
90%
VCC
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
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
50%
10%
90%
VCC
≈
VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
50%
tPZL
tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
≈
0 V
50%
50%
tPZH
tPHZ
Output
Waveform 2
(See Note B)
≈
VCC
Test
Point
From Output
Under Test
CL
(see Note A)
RL
VCC
S1
S2
LOAD CIRCUIT
PARAMETER
CL
tPZH
tpd or tt
tdis
ten
tPZL
tPHZ
tPLZ
1 k
1 k
50 pF
or
150 pF
50 pF
Open
Closed
RL
S1
Closed
Open
S2
Open
Closed
Closed
Open
50 pF
or
150 pF
Open
Open
NOTES: A. CL includes probe and test-fixture capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. 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.
D. The outputs are measured one at a time with one input transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
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