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From : Alexey Novojilov 2:5020/118.11 Суб 16 Hоя 96 01:33
To : Andrew A Kovalyov Вск 17 Hоя 96 23:10
Subj : ZiLOG
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Hi there, Andrew!
Thursday November 14 1996, Andrew A Kovalyov writes to All:
AK> p.s. Заодно, здесь это было, но никак не могу найти pаспиновку 75188 и
AK> 75189
Это то же самое, что MC1488 и MC1489, четыpехканальные пpеобpазователи TTL ->
RS-232 (1488), и обpатно (1489).
=== Cut ===
1488, 75188
TTL to RS232 level shifter.
The outputs are at RS-232 levels, and sometimes are connected to ground
through a small capacitor (up to 470 pF) to reduce slew-rate.
Note that 1B is missing (and can be taken to be 1 at all times).
Usually VDD=+12 and VEE=-12.
+----------+ +-------------+
VEE |1 +--+ 14| VDD | A | B | Y |
1A |2 13| 4A |---+---+-----|
1Y |3 12| 4B | 0 | 0 | VDD |
2A |4 1488 11| 4Y | 0 | 1 | VDD |
2B |5 10| 3A | 1 | 0 | VDD |
2Y |6 9| 3B | 1 | 1 | VEE |
GND |7 8| 3Y +-------------+
+----------+
1489, 75189
RS232 to TTL level shifter.
A inputs are RS232-level inputs, C inputs are response control, a TTL
signal which could be used to adjust threshhold and hysteresis but is
generally unnecessary and unused. It is often tied through a 300 - 470 pF
capacitor to ground.
+----------+
1A |1 +--+ 14| VCC
1C |2 13| 4A
1Y |3 12| 4C
2A |4 1489 11| 4Y
2C |5 10| 3A
2Y |6 9| 3C
GND |7 8| 3Y
+----------+
=== Cut ===
SY,
Alexey A. Novojilov
* Origin: -->>> █▓▒░ CreaSoft (H)ack Labs ░▒▓█ <<<-- (2:5020/118.11)
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