ST72T774J9B1 STMicroelectronics, ST72T774J9B1 Datasheet - Page 14

• 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

ST72774/ST727754/ST72734
1.4 External connections
The following figure shows the recommended ex-
ternal connections for the device.
The V
and EPROM devices and must be tied to ground in
user mode.
The 10 nF and 0.1 µF decoupling capacitors on
the power supply lines are a suggested EMC per-
formance/cost tradeoff.
Figure 4. Recommended External Connections
14/144
PP
pin is only used for programming OTP
EXTERNAL RESET CIRCUIT
V
DD
Or configure unused I/O ports
by software as input with pull-up
10nF
0.1µF
0.1µF
V
DD
+
V
DD
4.7K
0.1µF
10K
1K
See
Clocks
Section
The external reset network (including the manda-
tory 1K serial resistor) is intended to protect the
device against parasitic resets, especially in noisy
environments.
Unused I/Os should be tied high to avoid any un-
necessary power consumption on floating lines.
An alternative solution is to program the unused
ports as inputs with pull-up.
V
V
V
RESET
Unused I/O
OSCOUT
OSCIN
PP
DD
SS