Am7992B

Features:

*Compatible with lEEE 802.3/Ethernet/Cheapernet specifications 
*Crystal/TTL oscillator-controlled Manchester encoder 
*Manchester decoder acquires clock and data within four bit times with an accuracy of ±3 ns 
*Guaranteed carrier and collision detection squelch threshold limits
- Carrier/collision detected for inputs greater than 275 mV
- No carrier/collision for inputs less than 175 mV
*Input signal conditioning rejects transient noise
- Transients <10 ns for collision detector inputs
- Transients <20 ns for carrier detector inputs
*Receiver decodes Manchester data with worst case ±19 ns of clock jitter (at 10 MHz) 
*TTL-compatible host interface
*Transmit accuracy +0.01% (without adjustments)


Pinout




Specifications

Storage Temperature . . . . . . . . . . . 65°C to +150°C
Ambient Temperature with
Power Applied . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Supply Voltage Continuous . . . . . . . . . . . . . . . +7.0 V
DC Voltage Applied to Outputs . . . 0.5 V to VCC Max
DC Input Voltage (Logic Inputs) . . . . . . . . . . . +5.5 V
DC Input Voltage
(Receive±/Collision±) . . . . . . . . . . . . . 6 V to +16 V
Transmit± Output Current . . . . . . 50 mA to +25 mA
DC Output Current, Into Outputs . . . . . . . . . . 100 mA
DC Input Current (Logic Inputs) . . . . . . . . . . ±30 mA
Transmit± Applied Voltage . . . . . . . . . . 0 V to +16 V


Description

The Am7992B Serial Interface Adapter (SIA) is a Manchester encoder/decoder compatible with IEEE 802.3, Cheapernet, and Ethernet specifications. In an IEEE 802.3/Ethernet application, the Am7992B interfaces the Am7990 Local Area Network Controller for Ethernet (LANCE) to the Ethernet transceiver device,acquires clock and data within four bit times, and decodes Manchester data with worst case ±19 ns phase jitter at 10 MHz. SIA provides both guaranteed signal threshold limits and transient noise suppression circuitry in both data and collision paths to minimize false start conditions.