W65C21N6TPLG-14 Western Design Center (WDC), W65C21N6TPLG-14 Datasheet - Page 3

• Manufacturer Part Number: W65C21N6TPLG-14
• Description: Peripheral Drivers & Components - PCIs Peripheral Interface Adapter
• Manufacturer: Western Design Center (WDC)

Specifications of W65C21N6TPLG-14

• Rohs: yes
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-44
• Input Voltage Range (max): 5.5 V
• Minimum Operating Temperature: - 40 C
• Factory Pack Quantity: 27
• Supply Current (max): - 0.4 mA

INTRODUCTION
The WDC W65C21 (W65C21N and W65C21S) is a very flexible Peripheral Interface Adapter (PIA) for
use with WDC’s 65xx, 68xx, and other 8-bit microprocessor families. The W65C21 provides programmed
microprocessor control of up to two peripheral devices (Port A and Port B). Peripheral device control is
accomplished through two 8-bit bidirectional I/O Ports, with individually designed Data Direction
Registers. The Data Direction Registers provide selection of data flow direction (input or output) at each
respective I/O Port. Data flow direction may be selected on a line-by-line basis with intermixed input and
output lines within the same port. The “handshake” interrupt control feature is provided by four peripheral
control lines.
microprocessor and peripheral devices, as well as bidirectional data transfer between W65C21 Peripheral
Interface Adapters in multiprocessor systems.
FEATURES
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Figure 1 44 Pin PLCC Pin Configuration
Low Power CMOS N-well silicon gate technology
The W65C21N is plug replacement of NMOS and CMOS 6521 and 6821 devices with current
limiting resistors
The W65C21S is lower power, faster and direct drive outputs with no current limiting resistors.
High speed/Low power replacement for Motorola/Rockwell/AMI/MOS
Technology/MOSTEK/HITACHI/ ST Microelectronics/GTE/CMD 6520, 6521, 6820, 6821 PIA’s
Two 8-bit bidirectional I/O ports with individual data direction control.
Automatic “Handshake” control of data transfers
Two interrupts (one for each port) with program control
Static to 14MHz operation, with high speed Port A, CA2 outputs.
Industrial temperature range
40 Pin Plastic DIP and 44 Pin Plastic PLCC versions
5 volt ± 10% supply requirements
Compatible with the 65xx and 68xx family of microprocessors
This capability provides enhances control over data transfer functions between the
Figure 2 40 Pin DIP Pin Configuration
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