UA9638 Dual High-Speed Differential Line Driver |


Dual High-Speed Differential Line Driver

Dual High-Speed Differential Line Driver - UA9638


The uA9638C is a dual high-speed differential line driver designed to meet ANSI Standard EIA/TIA-422-B. The inputs are TTL and CMOS compatible and have input clamp diodes. Schottky-diode-clamped transistors are used to minimize propagation delay time. This device operates from a single 5-V power supply and is supplied in an 8-pin package.

The uA9638 provides the current needed to drive low-impedance loads at high speeds. Typically used with twisted-pair cabling and differential receiver(s), base-band data transmission can be accomplished up to and exceeding 15 Mbps in properly designed systems. The uA9637A dual line receiver is commonly used as the receiver. For even faster switching speeds in the same pin configuration, see the SN75ALS191.

The uA9638C is characterized for operation from 0°C to 70°C.


  • Meets or Exceeds ANSI Standard EIA/TIA-422-B
  • Operates From a Single 5-V Power Supply
  • Drives Loads as Low as 50 up to 15 Mbps
  • TTL- and CMOS-Input Compatibility
  • Output Short-Circuit Protection
  • Interchangeable With National SemiconductorTM DS9638

    National Semiconductor is a trademark of National Semiconductor Corporation.

View more

Parametrics Compare all products in RS-485/RS-422

Supply Voltage(s) (Nom) (V)
Number of TX
Number of RX
Signaling Rate (Max) (Mbps)
IEC 61000-4-2 contact (+/- kV)
Fault protection (V)
Number of nodes
Common mode range
ICC (Max) (mA)
Operating temperature range (C)
Package Group
Approx. price (US$)
UA9638 UA9637A
5     5    
2     0    
0     2    
15     10    
None     None    
None     None    
-15 to 15     -15 to 15    
32     32    
-7 to 7     -7 to 7    
65     50    
No     No    
Catalog     Catalog    
0 to 70     0 to 70    
PDIP | 8
SOIC | 8    
PDIP | 8
SOIC | 8    
0.25 | 1ku     0.46 | 1ku