MIC74BQS Micrel Inc, MIC74BQS Datasheet - Page 2

• Manufacturer Part Number: MIC74BQS
• Description: IC I/O EXPANDER I2C 8B 16QSOP
• Manufacturer: Micrel Inc
• Series: -r

Specifications of MIC74BQS

• Interface: I²C, SMBus
• Number Of I /o: 8
• Interrupt Output: Yes
• Frequency - Clock: -
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.154", 3.90mm Width)
• Includes: -
• Lead Free Status / Rohs Status: Contains lead / RoHS non-compliant

Pin Configuration
Pin Description
Micrel, Inc.
October 2006
Pin Number
9 – 12
1 – 3
4 – 7
13
14
15
16
8
(/SHDN, /FS0 – FS2)
Pin Name
A0 – A2
P0 – P3
P4 – P7
/ALERT
DATA
GND
VDD
CLK
Pin Function
Address (Input): Slave address selection inputs; sets the three least significant bits of the
MIC74’s slave address.
Parallel I/O (Input/Output): General-purpose I/O pin. Direction and output type are user
programmable.
Ground
Parallel I/O (Input/output): P4–P7 are general-purpose I/O pins. Direction and output type
are user programmable.
Shutdown (Output): When the FAN bit is set, pin 9 becomes SHDN.
Fan Speed (Output): When the FAN bit is set, pins 10 through 12 become /FS0–/FS2
respectively, controlled by the FAN_SPEED register.
Interrupt (Output): Active-low, open-drain output signals input-change-interrupts to the host
on this pin. Signal is cleared when the bus master (host) polls the ARA (alert response
address = 0001 100) or reads status.
Serial Bus Clock (Input): The host provides the serial bit clock in this input.
Serial Data (Input/Output): Serial data input and open-drain serial data output.
Power Supply (Input).
GND
A0
A1
A2
P0
P1
P2
P3
1
2
3
4
5
6
7
8
16-Pin QSOP (QS)
2
16 VDD
15
14
13
12
11
10
9
DATA
CLK
/ALERT
P7 (/FS2)
P6 (/FS1)
P5 (/FS0)
P4 (/SHDN0)
M9999-101006
MIC74