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ST68C554CJ68 Datasheet(PDF) 5 Page - Exar Corporation |
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ST68C554CJ68 Datasheet(HTML) 5 Page - Exar Corporation |
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5 / 39 page  ST16C554/554D 5 REV. 4.0.1 2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. DTRA# DTRB# DTRC# DTRD# 3 15 34 46 12 24 46 58 O UART channels A-D Data-Terminal-Ready (active low) or general purpose out- put. If these outputs are not used, leave them unconnected. DSRA# DSRB# DSRC# DSRD# 1 17 32 48 10 26 44 60 I UART channels A-D Data-Set-Ready (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. CDA# CDB# CDC# CDD# 64 18 31 49 9 27 43 61 I UART channels A-D Carrier-Detect (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. RIA# RIB# RIC# RID# 63 19 30 50 8 28 42 62 I UART channels A-D Ring-Indicator (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. ANCILLARY SIGNALS XTAL1 25 35 I Crystal or external clock input. XTAL2 26 36 O Crystal or buffered clock output. 16/68# - 31 I Intel or Motorola Bus Select (input with internal pull-up). When 16/68# pin is HIGH, 16 or Intel Mode, the device will operate in the Intel bus type of interface. When 16/68# pin is LOW, 68 or Motorola mode, the device will operate in the Motorola bus type of interface. Motorola bus interface is not available on the 64 pin package. RESET (RESET#) 27 37 I When 16/68# pin is HIGH for Intel bus interface, this input becomes the Reset pin (active high). In this case, a 40 ns minimum HIGH pulse on this pin will reset the internal registers and all outputs. The UART transmitter output will be held HIGH, the receiver input will be ignored and outputs are reset during reset period (Table 13). When 16/68# pin is at LOW for Motorola bus interface, this input becomes Reset# pin (active low). This pin functions similarly, but instead of a HIGH pulse, a 40 ns minimum LOW pulse will reset the internal registers and outputs. Motorola bus interface is not available on the 64 pin package. VCC 4, 21, 35, 52 13, 30, 47, 64 Pwr 2.97V to 5.5V power supply. GND 14, 28, 45, 61 6, 23, 40, 57 Pwr Power supply common, ground. N.C. - - No Connection. These pins are not used in either the Intel or Motorola bus modes. Pin Description NAME 64-LQFP PIN # 68-PLCC PIN# TYPE DESCRIPTION |
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