CMS82C55AZ Intersil, CMS82C55AZ Datasheet - Page 10

• Manufacturer Part Number: CMS82C55AZ
• Description: IC I/O EXPANDER 24B 44PLCC
• Manufacturer: Intersil

Specifications of CMS82C55AZ

• Interface: Programmable
• Number Of I /o: 24
• Interrupt Output: No
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Clock: -

ACK - (Acknowledge Input). A “low” on this input informs the
82C55A that the data from Port A or Port B is ready to be
accepted. In essence, a response from the peripheral device
indicating that it is ready to accept data, (See Note 1).
INTR - (Interrupt Request). A “high” on this output can be
used to interrupt the CPU when an output device has
accepted data transmitted by the CPU. INTR is set when
ACK is a “one”, OBF is a “one” and INTE is a “one”. It is reset
by the falling edge of WR.
INTE A
Controlled by Bit Set/Reset of PC6.
INTE B
Controlled by Bit Set/Reset of PC2.
NOTE:
CONTROL WORD
D7
1. To strobe data into the peripheral device, the user must operate
1
the strobe line in a hand shaking mode. The user needs to send
OBF to the peripheral device, generates an ACK from the
peripheral device and then latch data into the peripheral device
on the rising edge of OBF.
D6
0
PERIPHERAL
INPUT FROM
D5
1
D4
1
INTR
STB
1/0
D3 D2 D1 D0
IBF
RD
PC6, PC7
1 = INPUT
0 = OUTPUT
RD
10
MODE 1 (PORT A)
INTE
A
MS82C55A, MQ82C55A, MP82C55A
PC6, PC7
PA7-PA0
tPS
tSIB
PC4
PC5
PC3
FIGURE 7. MODE 1 (STROBED INPUT)
tST
FIGURE 6. MODE 1 INPUT
2
8
STBA
IBFA
INTRA
I/O
tSIT
tPH
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
CONTROL WORD
D7
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1
1
D6
0
D5
1
tRIT
D4
1
1/0
D3 D2 D1 D0
FIGURE 8. MODE 1 OUTPUT
1
1
PC4, PC5
1 = INPUT
0 = OUTPUT
WR
WR
1
0
RD
tRIB
MODE 1 (PORT B)
MODE 1 (PORT A)
MODE 1 (PORT B)
INTE
INTE
INTE
B
A
B
PC4, PC5
PB7-PB0
PB7-PB0
PA7-PA0
PC7
PC6
PC3
PC1
PC2
PC0
PC2
PC1
PC0
June 15, 2006
2
8
8
FN6140.2
8
STBB
IBFB
INTRB
OBFA
ACKA
INTRA
OBFB
ACKB
INTRB