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參數(shù)資料
| 型號(hào)： | SNJ54ACT245K |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| 中文描述： | 八路總線收發(fā)器與三態(tài)輸出 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 498K |
| 代理商： | SNJ54ACT245K |
SN54ACT245, SN74ACT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS452E
–
SEPTEMBER 1994
–
REVISED OCTOBER 2002
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V
±
0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
TA = 25
°
C
TYP
SN54ACT245
MIN
1
SN74ACT245
MIN
1.5
UNIT
(OUTPUT)
MIN
MAX
7.5
MAX
MAX
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
A or B
B or A
1
4
9
8
ns
1
4
8
1
10
1
9
OE
A or B
1
5
10
1
12
1.5
11
ns
1
5.5
10
1
13
1.5
12
OE
A or B
1
1
5.5
10
10
1
1
12
12
1
11
11
ns
5
1.5
operating characteristics, V
CC
= 5 V, T
A
= 25
°
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
CL = 50 pF,
f = 1 MHz
45
pF
PARAMETER MEASUREMENT INFORMATION
LOAD CIRCUIT
tPLH
tPHL
3 V
0 V
50% VCC
50% VCC
VOH
VOL
Input
Output
VOLTAGE WAVEFORMS
From Output
Under Test
CL = 50 pF
(see Note A)
S1
2
×
VCC
Open
500
500
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2
×
VCC
Open
TEST
S1
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2
×
VCC
(see Note B)
Output
Waveform 2
S1 at Open
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
≈
VCC
0 V
50% VCC
VOL + 0.3 V
50% VCC
≈
0 V
VOLTAGE WAVEFORMS
VOH
–
0.3 V
3 V
1.5 V
1.5 V
1.5 V
1.5 V
NOTES: A. CL includes probe and jig 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. All input pulses are supplied by generators having the following characteristics: PRR
≤
1 MHz, ZO = 50
, tr
≤
2.5 ns, tf
≤
2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
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