Features: · Single-Chip Interface Solution for AppleTalkTM and LocalTalkE
· Designed to Operate Up To 1 Mbps In AppleTalk and LocalTalk
· Switched-Capacitor Voltage Converter Allows for Single 5-V Operation
· 4-kV ESD Protection on Bus Terminals
· Combines Multiple Components into a Single Chip Solution
· LinBiCMOSTM Process TechnologyPinout
SpecificationsSupply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 to 7 V
Supply voltage range, VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 7 to 0.5 V
Receiver input voltage range, VI (RA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V to 15 V
Receiver differential input voltage range, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V to 12 V
Receiver output voltage range, VO (RY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.5 V to 5.5 V
Driver output voltage range, VO (Power Off) (DY, DZ, HSKY) . . . . . . . . . . . . . . . . . . . 15 V to 15 V
(Power On) (DY, DZ, HSKY) . . . . . . . . . . . . . .. . . . . . 11 V to 11 V
Driver input voltage range, VI (DA, HSKA, DEN, REN) . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.4 V
Electrostatic discharge (see Note 2) Class 3, A: Bus terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 kV
All other terminals . . . . . . . . . . . . .. . . . . . . . . . . 2 kV
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range,TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to network ground terminal unless otherwise noted.
2. This maximum rating is tested according to MIL-STD-883C, Method 3015.7.
DescriptionThe SN75LBC775 is a low-power LinBiCMOSE device that incorporates the drivers and receivers for an AppleTalk or a LocalTalk interface and a switched-capacitor voltage converter for a single 5-V supply operation. LocalTalk uses a hybrid of RS-422 with the transceiver connected to the network through a small isolation transformer. The AppleTalk mode provides point-to-point communications and uses the same differential driver and receiver as LocalTalk with the addition of a hybrid RS-423, single-ended handshake driver (HSK) and receiver. In the AppleTalk mode, the port connects directly to the receiver with no isolation transformer.
While the device SN75LBC775 power is turned off (VCC = 0) or disabled in the LocalTalk mode, the outputs are in a high-impedance state. When the driver enable(DEN) terminal is high, both the differential and serial driver outputs are in a high-impedance state.
The SN75LBC775 receiver output can be disabled and becomes a high impedance when the REN terminal is low.
A switched-capacitor voltage converter generates the negative voltage required from a single 5-V supply using two 22-F capacitors. One capacitor
is between the C+ and C terminals and the second is between VSS and ground.The SN75LBC775 is characterized for operating over the temperature range of 0°C to 70°C.
SN75LBC775 Data Sheet
