The SN75112N dual line driver has improved output current regulation with supply voltage and temperature variations. In addition, the higher current of the SN75112N (27 mA) allows data to be transmitted over longer lines. These drivers offer optimum performance when used with the SN55107A, SN75107A, and SN75108A line receivers.
These drivers feature independent channels with common voltage supply and ground terminals. The significant difference between the three drivers is in the output-current specification. The driver circuits feature a constant output current that is switched to either of two output terminals by the appropriate logic levels at the input terminals. The output current can be switched off (inhibited) by low logic levels on the enable inputs. The output current is nominally 27 mA for the SN75112.
The enable/inhibit feature is provided so the circuits can be used in party-line or data-bus applications. A strobe or inhibitor (enable D), common to both drivers, is included for increased driver-logic versatility. The output current in the inhibited mode, IO(off), is specified so that minimum line loading is induced when the driver is used in a party-line system with other drivers. The output impedance of the driver in the inhibited mode is very high. The output impedance of a transistor is biased to cutoff.
The driver outputs have a common-mode voltage range of –3 V to 10 V, allowing common-mode voltage on the line without affecting driver performance. All inputs are diode clamped and are designed to satisfy TTL-system requirements. The inputs are tested at 2 V for high-logic-level input conditions and 0.8 V for low-logic-level input conditions. These tests ensure 400-mV noise margin when interfaced with TTL Series 54/74. The SN75112N is characterized for operation from 0°C to 70°C.
Improved Stability Over Supply Voltage and Temperature Ranges
Standard Supply Voltages
High Output Impedance
High Common-Mode Output Voltage Range ...–3 V to 10 V
Inhibitor Available for Driver Selection
Glitch-Free During Power Up/Power Down
Datasheet Available:Texas Instruments SN75112N
14 pin DIP. Manufactured by Texas Instruments.