Cypress Semiconductor CY2291 Ficha de especificações - Página 2

Procurar online ou descarregar pdf Ficha de especificações para Hardware informático Cypress Semiconductor CY2291. Cypress Semiconductor CY2291 12 páginas. Cypress three-pll general purpose eprom programmable clock generator specification sheet

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Pinouts
Pin Definitions
Name
Pin Number
32XOUT
32K
CLKC
VDD
GND
[1]
XTALIN
[1, 2]
XTALOUT
XBUF
CLKD
CPUCLK
CLKB
CLKA
CLKF
S0
S1
S2/SUSPEND
SHUTDOWN/OE
VBATT
32XIN
Notes
1. For best accuracy, use a parallel-resonant crystal, C
2. Float XTALOUT pin if XTALIN is driven by reference clock (as opposed to crystal).
3. Please refer to application note "Understanding the CY2291, CY2292 and CY2295" for more information.
4. 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.
Document #: 38-07189 Rev. *C
Figure 1. CY2291- 20-pin SOIC
32XOUT
1
32K
2
3
CLKC
4
V DD
GND
5
XTALIN
6
XTALOUT
7
XBUF
8
CLKD
9
CPUCLK
10
1
32.768-kHz crystal feedback.
2
32.768-kHz output (always active if VBATT is present).
3
Configurable clock output C.
4, 16
Voltage supply.
5
Ground.
Reference crystal input or external reference clock input.
6
Reference crystal feedback.
7
8
Buffered reference clock output.
9
Configurable clock output D.
10
CPU frequency clock output.
11
Configurable clock output B.
12
Configurable clock output A.
13
Configurable clock output F.
14
CPU clock select input, bit 0.
15
CPU clock select input, bit 1.
17
CPU clock select input, bit 2. Optionally enables suspend feature when LOW.
18
Places outputs in three-state
places outputs in three-state
19
Battery supply for 32.768-kHz circuit.
20
32.768-kHz crystal input.
≈ 17 pF or 18 pF.
LOAD
32XIN
20
19
V BATT
18
SHUTDOWN/OE
17
S2/SUSPEND
16
V DD
15
S1
14
S0
13
CLKF
12
CLKA
CLKB
11
Description
[4]
condition and shuts down chip when LOW. Optionally, only
[4]
condition and does not shut down chip when LOW.
CY2291
[3]
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