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PDF CY28359 Data sheet ( Hoja de datos )
| Número de pieza | CY28359 | |
| Descripción | 273-MHz 6-Output Buffer | |
| Fabricantes | Cypress Semiconductor | |
| Logotipo |  |
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PRELIMINARY
CY28359
273-MHz 6-Output Buffer for DDR400 DIMMS
Features
• Dual 1- to 3-output buffer/driver
• Supports up to 2 DDR DIMMs
• Outputs are individually enabled/disabled
• Low-skew outputs (< 100 ps)
• Supports 266-MHz, 333-MHz and 400-MHz DDR SDRAM
• SMBus Read and Write support
• Space-saving 28-pin SSOP package
Functional Description
The CY28359 is a 2.5V buffer designed to distribute
high-speed clocks in PC applications. The part has 6 differ-
ential outputs. Designers can configure these outputs to
support up to two DDR DIMMs. The CY28359 can be used in
conjunction with the CY28326 or similar clock synthesizer for
the VIA P4X600 chipset.
The CY28359 also includes an SMBus interface which can
enable or disable each output clock. On power-up, all output
clocks are enabled.
Block Diagram
BUF_INA
SDATA
SEL_ADDR
SCLK
BUFF_INB
SMBus
Decoding
FB_OUTA
DDRAT0
DDRAC0
DDRAT1
DDRAC1
DDRAT2
DDRAC2
DDRBT0
DDRBC0
DDRBT1
DDRBC1
DDRBT2
DDRBC2
FB_OUTB
Pin Configuration
FB_OUTB
BUF_INB
DDRBT0
DDRBC0
DDRBT1
DDRBC1
VDD
VSS
FB_OUTA
BUF_INA
VSS
DDRAT0
DDRAC0
DDRAT1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VDD
27 VSS
26 SEL_ADDR
25 DDRBT2
24 DDRBC2
23 VSS
22 VDD
21 DDRAT2
20 DDRAC2
19 SDATA
18 SCLK
17 VSS
16 VDD
15 DDRAC1
28 PIN SSOP
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07636 Rev. **
Revised February 16, 2004
1 page  
PRELIMINARY
CY28359
Absolute Maximum Conditions
Supply Voltage to Ground Potential ..................–0.5 to +4.0V
DC Input Voltage (except BUF_IN) ............ –0.5V to VDD+0.5
Storage Temperature .................................. –65°C to +150°C
Operating Conditions
Static Discharge Voltage............................................ >2000V
(per MIL-STD-883, Method 3015)
Parameter
VDD2.5
TA
COUT
CIN
Description
Supply Voltage
Operating Temperature (Ambient Temperature)
Output Capacitance
Input Capacitance
Min. Typ. Max. Unit
2.375 – 2.625 V
–40 –
85 °C
– 6 – pF
– 5 – pF
Electrical Characteristics Over the Operating Range
Parameter
Description
Test Conditions
Min.
Typ.
Max.
Unit
VIL
VIH
IIL
IIH
IOH
IOL
VOL
VOH
IDD
IDD
VOUT
Input LOW Voltage
Input HIGH Voltage
Input LOW Current
Input HIGH Current
Output HIGH Current
Output LOW Current
Output LOW Voltage
Output HIGH Voltage
Supply Current
Supply Current
Output Voltage Swing
For all pins except SMBus
VIN = 0V
VIN = VDD
VDD = 2.375V
VOUT = 1V
VDD = 2.375V
VOUT = 1.2V
IOL = 12 mA, VDD = 2.375V
IOH = –12 mA, VDD = 2.375V
Unloaded outputs, 273 MHz
Loaded outputs, 273 MHz
See Test Circuitry (Refer to
Figure 1)
–
2.0
–
–
–18
26
–
1.7
–
–
0.7
– 0.8 V
– –V
– 5 µA
– 5 µA
–32 – mA
35 – mA
– 0.6 V
– –V
– 250 mA
– 300 mA
–
VDD + 0.6
V
VOC
INDC
Output Crossing Voltage
Input Clock Duty Cycle
(VDD/2) – 0.2
48
VDD/2
(VDD/2) + 0.2
52
V
%
Switching Characteristics[1]
.
Parameter
Name
Test Conditions
Min. Typ. Max. Unit
FO Operating Frequency
66 – 273 MHz
TDC Duty Cycle = t2 ÷ t1
Measured at VDD/2 for 2.5V outputs. INDC – 2% – INDC + 2% %
t3
DDR Rising/Falling Edge Rate[2] Measured between 20% to 80% of
1
–
3 V/ns
output (Refer to Figure 1)
t4
Output to Output Skew[2]
All outputs equally loaded
– – 100 ps
Notes:
1. Parameter is guaranteed by design and characterization. Not 100% tested in production
2. All parameters specified with loaded outputs.
Document #: 38-07636 Rev. **
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CY28359.PDF ] | |
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