AM26C32: Input signal

1. A and B are analog inputs; there is no "H" or "L" level. A shown in table 7-1, when the differential input voltage is less than ±200 mV, the output is undefined.

2. The web page says 10 Mbps. But the worst-case propagation delay of 27 ns would allow 37 Mbps. (As far as I can see, there is no specification of how much power it would consume at that speed.)

Hi Tatsu,

1.For differential receivers you don't independently input signals on A and B. Its the voltage differential between them. VA and VB don't have logic states that are being traced by transceiver. The digital signal is VID - which is VA - VB. VID = H when VA - VB >= 200mV and VID = L when VA - VB <= -200mV. VID = Undefined when -200mV < VA - VB < 200mV. 

2. On the web page we say 10Mbps, but that's because this is an RS-422 device and RS-422 doesn't spec above 10Mbps; however, in reality propagation delay is what limits the differential receiver - and its limited to 27ns worst case which would allow 37Mbps assuming a 50pF capacitance load (more capacitance will slow this down) - the power consumption may be high though. 

Best,

Parker Dodson