ST72T774J9B1 STMicroelectronics, ST72T774J9B1 Datasheet - Page 27

• Manufacturer Part Number: ST72T774J9B1
• Manufacturer: STMicroelectronics

Specifications of ST72T774J9B1

• Cpu Family: ST7
• Device Core Size: 8b
• Frequency (max): 24MHz
• Interface Type: I2C/USB
• Program Memory Type: EPROM
• Program Memory Size: 60KB
• Total Internal Ram Size: 1KB
• # I/os (max): 31
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4V
• On-chip Adc: 1-chx8-bit
• On-chip Dac: 1-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 42
• Package Type: SPDIP
• Lead Free Status / Rohs Status: Specific Sites Compliant

4 ON-CHIP PERIPHERALS
4.1 I/O PORTS
4.1.1 Introduction
The I/O ports allow the transfer of data through
digital inputs and outputs, and, for specific pins,
the input of analog signals or the Input/Output of
alternate signals for on-chip peripherals (DDC,
TIMER...).
Figure 15. I/O Pin Typical Circuit
Note: This is the typical I/O pin configuration. For cost optimization, each port is customized with a specific configuration.
Alternate Input
DR SEL
DDR SEL
DDR
latch
DR
latch
Alternate
output
1
0
Alternate enable
1
0
Each pin can be programmed independently as
digital input or digital output. Each pin can be an
analog input when an analog switch is connected
to the Analog to Digital Converter (ADC).
Alternate enable
Analog Enable
Digital Enable
(ADC)
Alternate Enable
ST72774/ST727754/ST72734
Analog
Switch (if required)
PULL-UP (if required)
V
N-BUFFER
SS
V
DD
(if required)
P-BUFFER
PAD
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