HD26C32A
Quadruple Differential Line Receivers With 3 State Outputs
ADE-205-575 (Z)
1st. Edition
Dec. 2000
Description
The HD26C32A provides differential line receivers which realize low power dissipation by CMOS process.
The device has four receivers which meet the requirements of EIA standard RS-422A and RS-423A in a 16
pin package.
The enable function is common to all four receivers and offers a choise of active high or active low inputs.
Fail safe design ensures that if the inputs are open the outputs will always be high.
Features
Low power dissipation with CMOS process
Meets EIA standard RS-422A/423A
Input sensitivity: 0.2V (In the range of 7 V of common mode input voltage)
Propagation delay time: 19 ns typ
Input hysteresis width: 60 mV typ
Three state outputs
Differential Inputs are includes fail safe circuit
Power up and power down protection
Pin to pin compatible with HD26LS32/32A
HD26C32A
2
Pin Arrangement
(Top view)
1
2
3
4
5
6
7
IN A1
GND
IN A2
OUT A
OUT C
8
Enable
IN C2
IN C1
13
14
15
10
11
12
9
16 V
CC
IN B1
IN B2
OUT B
Enable
OUT D
IN D2
IN D1
Function Table
Differential Input
Enable
Enable
Outputs
V
ID
V
TH
or OPEN
H
X
H
X
L
V
TL
< V
ID
< V
TH
H
X
?
X
L
V
ID
V
TH
H
X
L
X
L
X
L
H
Z
H :
High level
L
:
Low level
Z
:
High impedance
X :
Irrelevant
?
:
Indeterminate
HD26C32A
3
Absolute Maximum Ratings (Ta = 25C)
Item
Symbol
Ratings
Unit
Supply Voltage*
2
V
CC
7
V
Common Mode Input Voltage
V
CM
14
V
Differential Input Voltage*
3
V
DIFF
14
V
Enable Input Voltage
V
IN
7
V
Output Current
I
O
25
mA
Storage Temperature
Tstg
65 to +150
C
Notes: 1. The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
2. All voltage values except for differential input voltage are with respect to network ground
terminal.
3. Differential input voltage is measured at the noninverting input with respect to the corresponding
inverting input.
Recommended Operating Conditions (Ta = 40C to +85C)
Item
Symbol
Min
Typ
Max
Unit
Supply Voltage
V
CC
4.5
5.0
5.5
V
Common Mode Input Voltage
V
CM
--
--
7
V
Differential Input Voltage
V
DIFF
--
--
7
V
Output Current
I
O
--
--
6
mA
Operating Temperature
Topr
40
--
85
C
Enable Input Rise / Fall Time
t
r
, t
f
--
--
500
ns
Note:
1. This item guarantees maximum limit when one input switchies.
Waveform: Refer to test circuit of switching characteristics.
HD26C32A
4
Logic Diagram
IN A2
Enable G
Enable G
OUT A
OUT B
OUT C
OUT D
IN A1
IN B2
IN B1
IN C2
IN C1
IN D2
IN D1
+
+
+
+
Electrical Characteristics (Ta = 40C to +85C, V
CC
= 5 V 10%)
Item
Symbol
Min
Typ
Max
Unit
Conditions
Diffrential Input
V
TH
--
--
0.2
V
V
CM
= 7 to 7 V, V
OUT
3.8 V
Threshold Voltage
V
TL
--
--
0.2
V
V
CM
= 7 to 7 V, V
OUT
0.3 V
Input Hysteresis
V
HYST
--
60
--
mV
V
CM
= 0 V
Enable Input
V
IH
2.0
--
--
V
Voltage
V
IL
--
--
0.8
V
Output Voltage
V
OH
3.8
4.2
--
V
V
CC
= 4.5 V, V
DIEF
= 1 V, I
OUT
= 6.0 mA
V
OL
--
0.2
0.3
V
V
CC
= 5.5 V, V
DIEF
= 1 V, I
OUT
= 6.0 mA
Output Leak
I
OZ
--
0.5
5.0
A
Enable = 0.8 V,
Enable
= 2.0 V V
OUT
= V
CC
CurrentI
--
0.5
5.0
A
Enable = 0.8 V,
Enable
= 2.0 V V
OUT
= GND
Input Current
I
IN
--
1.1
1.5
mA
V
IN
= 10 V, Other Input = GND
0.1*
1
--
0.6
mA
V
IN
= 3 V, Other Input = GND
0
--
1.1
mA
V
IN
= 3 V, Other Input = GND
--
2.0
-2.5
mA
V
IN
= 10 V, Other Input = GND
Enable Input
I
I
--
--
1.0
A
V
I
= V
CC
Current
--
--
1.0
A
V
I
= GND
Input Resistance
R
IN
5.8
6.8
10
k
V
CM
= 7 to 7 V (One Input AC GND)
Supply Current
I
CC
16
23
mA
V
CC
= 5.5 V, V
DIEF
= 1 V
Note:
1. This specification is nonstandard of RS-422A.
HD26C32A
5
Switching Characteristics (Ta = 40C to +85C, V
CC
= 5 V 10%)
Item
Symbol
Min
Typ
Max
Unit
Conditions
Propagation Delay Time
t
PLH
7
16
25
ns
C
L
= 50 pF, V
DIEF
= 2.5 V, V
CM
= 0 V
t
PHL
7
16
25
ns
Output Rise / Fall Time
t
RISE
--
4
9
ns
C
L
= 50 pF, V
DIEF
= 2.5 V, V
CM
= 0 V
t
FALL
4
9
ns
Output Disable Time
t
LZ
--
13
22
ns
C
L
= 50 pF, R
L
= 1000
t
HZ
13
22
ns
V
DIEF
= 2.5 V
Output Enable Time
t
ZL
--
13
22
ns
C
L
= 50 pF, R
L
= 1000
t
ZH
13
22
ns
V
DIEF
= 2.5 V
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