TL16C552 ace equivalent, dual ace.
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IBM PC/AT is.
FN PACKAGE (TOP VIEW)
RXRDY0 DCD1 GND RI1 DSR1 CLK CS1 TRI PEMD ACK PE BUSY SLCT VDD ERR SIN1 RXRDY1
SOUT1 DTR1 RTS1 CTS1 DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7
TXRDY0 VDD
RTS0 DTR0 SOUT0
9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
10
60
11
59
12
58.
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