High-Speed 8-Bit Input and Output Ports
Description
CDP1872C, CDP1874C, CDP1875C
March 1997
High-Speed 8-Bit Input and Output Ports
Description
The CDP1872C, CDP1874C and CDP1875C devices are high-speed 8-bit parallel input and output ports designed for use in the CDP1800 microprocessor system and for general use in other microprocessor systems.
The CDP1872C and CDP1874C are 8-bit input ports; the CDP1875C is an 8-bit output port.
These devices have flexible capabilities as buffers and data latches and are reset by CLR input when the data strobe is not active.
The CDP1872C and CDP1874C are functionally identical except for device selects.
The CDP1872C has one active low and one active high select; the CDP1874C has two active high device selects.
These devices also feature Three-state outputs when deselected.
Data is strobed into the register on the leading edge of the CLOCK and latched on the trailing edge of the CLOCK.
The CDP1875C is an output port with data latched into the registers when the device selects are active.
There are two active high and one active low selects.
The output buffers are enabled at all times.
Features
• Parallel 8-Bit Input/Output Register with Buffered Outputs • High-Speed Data-In to Data-Out 85ns (Max) at VDD = 5V • Flexible Applications In Microprocessor Systems as Buffers and Latches • High Order Address-Latch Capability in CDP1800Series Microprocessor Systems • Output Sink Current = 5mA (Min) at VDD = 5V • Three-State Output - CDP1872C and CDP1874C
Ordering Information
PART NUMBER CDP1872CE CDP1874CE CDP1875CE TEMP.
RANGE -40oC to +85oC -40oC to +85oC -40oC to +85oC PACKAGE PDIP PDIP PDIP PKG.
NO.
E22.
4 E22.
4 E22.
4
Pinouts
CDP1872C INPUT PORT (PDIP) TOP VIEW
CS1 DI0 DO0 DI1 D01 DI2 D02 DI3 D03 CLOCK VSS 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 VDD DI7 D07 DI6 D06 DI5 D05 DI4 D04 CLR CS2 CS1 DI0 DO0 DI1 D01 DI2 D02 DI3 D03 CLOCK VSS
CDP1874C INPUT PORT (PDIP) TOP VIEW
1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 VDD DI7 D07 DI6 D06 DI5 D05 DI4 D04 CLR CS2 ...
Similar Datasheet
