SN75177B, SN75178B
DIFFERENTIAL BUS REPEATERS
SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
VIK
VO
|VOD1|
|VOD2|
|VOD3|
∆|V
OD|
VOC
∆|V
OC|
IO
IOZ
IIH
IIL
IOS
Input clamp voltage
Output voltage
Differential output voltage
Differential output voltage
Differential output voltage
Change in magnitude of
g
g
diferential output voltage‡
Common-mode
Common mode output voltage
Change in magnitude of
g
g
common-mode output voltage‡
Output current
High-impedance-state output current
High-level input current
Low-level input current
Short-circuit output current
VCC = 0,
VO = – 7 V to 12 V
VI = 2.4 V
VI = 0.4 V
VO = – 7 V
VO = VCC
VO = 12 V
ICC
Supply current (total package)
No load
Outputs enabled
Outputs disabled
57
26
VO = – 7 V to 12 V
TEST CONDITIONS
II = – 18 mA
IO = 0
IO = 0
RL = 100
Ω
,
RL = 54
Ω,
See Note 3
See Figure 1
See Figure 1
MIN
0
1.5
1/2 VOD1
or 2 §
1.5
1.5
2.5
5
5
±
0 2
0.2
RL = 54
Ω
or 100
Ω
Ω,
See Figure 1
3
–1
±
0 2
0.2
±
100
±
100
20
– 400
– 250
250
250
70
35
mA
mA
V
V
V
V
µA
µA
µA
µA
TYP†
MAX
– 1.5
6
6
UNIT
V
V
V
V
† All typical values are at VCC = 5 V and TA = 25°C.
‡
∆|V
OD| and
∆|V
OC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low
level.
§ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2, whichever is greater.
NOTE 3: See Figure 3.5 of EIA Standard RS-485.
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER
tdD
ttD
tPZH
tPZL
tPHZ
tPLZ
Differential-output delay time
Differential-output transition time
Output enable time to high level
Output enable time to low level
Output disable time from high level
Output disable time from low level
TEST CONDITIONS
RL = 54
Ω
Ω,
RL = 110
Ω,
RL = 110
Ω,
RL = 110
Ω,
RL = 110
Ω,
See Figure 3
See Figure 4
See Figure 5
See Figure 4
See Figure 5
MIN
TYP
15
20
85
40
150
20
MAX
20
30
120
60
250
30
UNIT
ns
ns
ns
ns
ns
ns
2–4
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DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
