SN75177B_10 Datasheet, PDF (4/12 Pages) Texas Instruments – DIFFERENTIAL BUS REPEATERS

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
TEST CONDITIONS
MIN
TYP† MAX UNIT
VIK
VO
|VOD1|
Input clamp voltage
Output voltage
Differential output voltage
|VOD2| Differential output voltage
|VOD3|
∆|VOD|
Differential output voltage
Change in magnitude of
diferential output voltage‡
VOC Common-mode output voltage
II = – 18 mA
IO = 0
IO = 0
RL = 100 Ω ,
RL = 54 Ω,
See Note 3
See Figure 1
See Figure 1
RL = 54 Ω or 100 Ω, See Figure 1
– 1.5 V
0
6V
1.5
6V
1/2 VOD1
or 2 ^§
V
1.5
2.5
5
1.5
5V
± 0.2 V
3
V
–1
∆|VOC|
Change in magnitude of
common-mode output voltage‡
± 0.2 V
IO
Output current
VCC = 0,
VO = – 7 V to 12 V
± 100 µA
IOZ
High-impedance-state output current
VO = – 7 V to 12 V
± 100 µA
IIH
High-level input current
VI = 2.4 V
20 µA
IIL
Low-level input current
VI = 0.4 V
– 400 µA
VO = – 7 V
– 250
IOS
Short-circuit output current
VO = VCC
250 mA
VO = 12 V
250
ICC
Supply current (total package)
No load
Outputs enabled
Outputs disabled
57
70
mA
26
35
† _{All typical values are at VCC = 5 V and TA = 25°C.}
‡ _{∆|VOD| and ∆|VOC| 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
TEST CONDITIONS
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
RL = 54 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 MAX UNIT
15
20 ns
20
30 ns
85 120 ns
40
60 ns
150 250 ns
20
30 ns
2–4
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