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74HC245 Datasheet(PDF) 6 Page - SHENZHEN FUMAN ELECTRONICS CO., LTD.

Part No. 74HC245
Description  OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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Manufacturer  FUMAN [SHENZHEN FUMAN ELECTRONICS CO., LTD.]
Direct Link  http://www.superchip.cn
Logo FUMAN - SHENZHEN FUMAN ELECTRONICS CO., LTD.

74HC245 Datasheet(HTML) 6 Page - SHENZHEN FUMAN ELECTRONICS CO., LTD.

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深圳市富满电子有限公司
SHENZHEN FUMAN ELECTRONICS CO., LTD.
74HC245(文件编号:S&CIC0524)
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
第 6 页 共 6 页
PARAMETER MEASUREMENT INFORMATION
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 = 50Ω, tr = 6ns, tf = 6ns.
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
1
2
3
4
5
6
A
B
C
D
6
5
4
3
2
1
D
C
B
A
Title
Num ber
Revision
Size
B
Date:
21-Nov-2006
Sheet
of
File:
E:\规格书\规格图\规格图-0\ZBO\74HC245.ddbDrawn By :
From output
Under test
Test
Point
CL
(see Note A)
LOAD CIRCUIT
Data
Input
50%
50%
10%
10%
90%
90%
tr
tf
VCC
0V
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
Input
In-Phase
Output
Out-of-Phase
Output
50%
50%
50%
50%
50%
50%
10%
10%
10%
10%
90%
90%
90%
90%
tPLH
tPLH
tPHL
tPHL
tf
tr
VOL
VOL
VOH
VOH
0V
VCC
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
tr
tf
Vcc
S1
S2
RL
50%
50%
50%
50%
90%
10%
tPZL
tPLZ
tPZH
tPHZ
≈0V
≈VCC
VOL
VOH
VCC
0V
≈VCC
Output
Control
(Low-level
Enabling)
Output
Waveform 1
(See Note B)
Output
Waveform 2
(See Note B)
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
PARAMETER
RL
CL
S1
S2
ten
tdis
tPZH
tPZL
tPHZ
tPLZ
tpd or tt
1KΩ
1KΩ
50pF
or
150pF
50pF
50pF
or
150pF
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Open
Open
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Closed
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