CY2291SC-XXX Cypress Semiconductor, CY2291SC-XXX Datasheet - Page 2

• Manufacturer Part Number: CY2291SC-XXX
• Description: Three-PLL General Purpose EPROM Programmable Clock Generator
• Manufacturer: Cypress Semiconductor

Pin Summary
Name
32XOUT
32K
CLKC
V
GND
XTALIN
XTALOUT
XBUF
CLKD
CPUCLK
CLKB
CLKA
CLKF
S0
S1
S2/SUSPEND
SHUTDOWN/OE
V
32XIN
Notes:
1.
2.
3.
4.
Pin Configurations
DD
BATT
For best accuracy, use a parallel-resonant crystal, C
Float XTALOUT pin if XTALIN is driven by reference clock (as opposed to crystal).
Please refer to application note “Understanding the CY2291, CY2292 and CY2295” for more information.
The CY2291 has weak pull-downs on all outputs (except 32K). Hence, when a three-state condition is forced on the outputs, the output pins are pulled LOW.
[1]
[1, 2]
Pin Number
1
2
3
4, 16
5
6
7
8
9
10
11
12
13
14
15
17
18
19
20
Description
32.768 kHz crystal feedback.
32.768 kHz output (always active if V
Configurable clock output C.
Voltage supply.
Ground.
Reference crystal input or external reference clock input.
Reference crystal feedback.
Buffered reference clock output.
Configurable clock output D.
CPU frequency clock output.
Configurable clock output B.
Configurable clock output A.
Configurable clock output F.
CPU clock select input, bit 0.
CPU clock select input, bit 1.
CPU clock select input, bit 2. Optionally enables suspend feature when LOW.
Places outputs in three-state
places outputs in three-state
Battery supply for 32.768-kHz circuit.
32.768-kHz crystal input.
LOAD
XTALOUT
CPUCLK
32XOUT
17 pF or 18 pF.
XTALIN
XBUF
CLKD
CLKC
GND
32K
V DD
20-pin SOIC
1
2
3
4
5
6
7
8
9
10
CY2291
2
[4]
[4]
20
19
18
17
16
15
14
13
12
11
condition and shuts down chip when LOW. Optionally, only
condition and does not shut down chip when LOW.
SHUTDOWN/OE
32XIN
V BATT
S2/SUSPEND
V DD
S1
S0
CLKF
CLKA
CLKB
BATT
is present).
CY2291
[3]