SN75177B, SN75178B
DIFFERENTIAL BUS REPEATERS
SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
VO
|VOD1|
|VOD2|
|VOD3|
∆|V
OD|
VOC
∆|V
OC|
IOS
IO
| |Vt| – |Vt||
|VOS|
|VOS – VOS|
|Isa|,|Isb|
|Ixa|,|Ixb|
Iia,Iib
RS-422-A
Voa, Vob
Vo
Vt (RL = 100
Ω)
RS-485
Voa, Vob
Vo
Vt (RL = 54
Ω)
Vt (Test Termination)
Measurement 2)
| |Vt| – |Vt||
|VOS|
|VOS – VOS|
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER
VT+
VT–
Vhys
VIK
VOH
VOL
IOZ
II
IIH
IIL
ri
IOS
ICC
Positive-going input threshold voltage
Negative-going input threshold voltage
Input hysteresis (VT+ – VT–)
Input clamp voltage at EN
High-level output voltage
Low-level output voltage
High-impedance-state
High impedance state output current
Line input current
High-level enable-input current
Low-level enable-input current
Input resistance
Short-circuit output current
Supply current (total package)
Su ly
ackage)
No load
Outputs enabled
Outputs disabled
II = – 18 mA
VID = 200 mV,
See Figure 2
VID = – 200 mV,
See Figure 2
VO = 0.4 V to 2 4 V
04
2.4
Other input at 0 V,
See Note 4
VIH = 2.7 V
VIL = 0.4 V
12
– 15
57
26
– 85
70
35
VI = 12 V
VI = – 7 V
IOH = – 400
µA,
IOL = 8 mA,
TEST CONDITIONS
VO = 2.7 V,
VO = 0.5 V,
IO = – 0.4 mA
IO = 8 mA
MIN
– 0.2‡
50
– 1.5
2.7
0.45
20
– 400
1
– 0.8
20
– 200
TYP†
MAX
0.2
UNIT
V
V
mV
V
V
V
µA
mA
µA
µA
kΩ
mA
mA
† All typical values are at VCC = 5 V, TA = 25°C.
‡ The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input
voltage and threshold voltage levels only.
NOTE 4: Refer to EIA Standard RS-422 for exact conditions.
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation delay time, low-to-high level output
Propagation delay time, high-to-low level output
Output enable time to high level
Output enable time to high level
Output disable time from high level
Output disable time from low level
TEST CONDITIONS
VID = – 1.5 V to 1.5 V,
,
CL = 15 pF,
See Figure 6
CL = 15 pF
pF,
CL = 15 pF
pF,
See Figure 7
See Figure 8
MIN
TYP
19
30
10
12
25
17
MAX
35
40
20
20
35
25
UNIT
ns
ns
ns
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2–5
TI [ TEXAS INSTRUMENTS ]
