CY7C4245-15JXC

CY7C4245-15JXC Datasheet


CY7C4425/4205/4215 CY7C4225/4235/4245

Part Datasheet
CY7C4245-15JXC CY7C4245-15JXC CY7C4245-15JXC (pdf)
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PDF Datasheet Preview
CY7C4425/4205/4215 CY7C4225/4235/4245
64/256/512/1K/2K/4K x 18 Synchronous FIFOs
• High speed, low power, first-in first-out FIFO memories
• 64 x 18 CY7C4425
• 256 x 18 CY7C4205
• 512 x 18 CY7C4215
• 1K x 18 CY7C4225
• 2K x 18 CY7C4235
• 4K x 18 CY7C4245
• High speed 100 MHz operation 10 ns read/write cycle time
• Low power ICC = 45 mA
• Fully asynchronous and simultaneous read and write operation
• Empty, Full, Half Full, and Programmable Almost Empty/Almost

Full status flags
• TTL compatible
• Retransmit function
• Output Enable OE pin
• Independent read and write enable pins
• Center power and ground for reduced noise
• Supports free running 50% duty cycle clock inputs
• Width Expansion Capability
• Depth Expansion Capability
• Available in 64 pin 14 x 14 TQFP, 64 pin 10 x 10 TQFP, and
68-pin PLCC

Functional Description

The CY7C42X5 are high speed, low power, first-in first-out FIFO memories with clocked read and write interfaces. All are 18 bits wide and are pin/functionally compatible to IDT722X5. The CY7C42X5 can be cascaded to increase FIFO depth. Programmable features include Almost Full/Almost Empty flags. These FIFOs provide solutions for a wide variety of data buffering needs, including high speed data acquisition, multiprocessor interfaces, and communications buffering.

These FIFOs have 18-bit input and output ports that are controlled by separate clock and enable signals. The input port is controlled by a free-running clock WCLK and a write enable pin WEN . When WEN is asserted, data is written into the FIFO on the rising edge of the WCLK signal. While WEN is held active, data is continually written into the FIFO on each cycle. The output port is controlled in a similar manner by a free-running read clock RCLK and a read enable pin REN . In addition, the CY7C42X5 have an output enable pin OE . The read and write clocks may be tied together for single-clock operation or the two clocks may be run independently for asynchronous read/write applications. Clock frequencies up to 100 MHz are achievable.

Retransmit and Synchronous Almost Full/Almost Empty flag features are available on these devices.

Depth expansion is possible using the cascade input WXI, RXI , cascade output WXO, RXO , and First Load FL pins. The WXO and RXO pins are connected to the WXI and RXI pins of the next device, and the WXO and RXO pins of the last device should be connected to the WXI and RXI pins of the first device. The FL pin of the first device is tied to VSS and the FL pin of all the remaining devices should be tied to VCC.

The CY7C42X5 provides five status pins. These pins are decoded to determine one of five states Empty, Almost Empty, Half Full, Almost Full, and Full see Table The Half Full flag shares the WXO pin. This flag is valid in the standalone and width-expansion configurations. In the depth expansion, this pin provides the expansion out WXO information that is used to signal the next FIFO when it will be activated.

The Empty and Full flags are synchronous, i.e., they change state relative to either the read clock RCLK or the write clock WCLK . When entering or exiting the Empty states, the flag is updated exclusively by the RCLK. The flag denoting Full states is updated exclusively by WCLK. The synchronous flag architecture guarantees that the flags will remain valid from one clock cycle to the next. As mentioned previously, the Almost Empty/Almost Full flags become synchronous if the VCC/SMODE is tied to VSS. All configurations are fabricated using an advanced 0.65m N-Well CMOS technology. Input ESD protection is greater than 2001V, and latch-up is prevented by the use of guard rings.
• San Jose, CA 95134-1709
• 408-943-2600
[+] Feedback

Logic Block Diagram

WCLK

WRITE CONTROL

FL/RT WXI

WXO/HF RXI RXO

WRITE POINTER

RESET LOGIC

EXPANSION LOGIC

Pin Configuration

Figure TQFP Top View

CY7C4425/4205/4215 CY7C4225/4235/4245

INPUT REGISTER

RAM ARRAY 64 x 18 256 x 18 512 x 18 1K x 18 2K x 18 4K x 18

FLAG PROGRAM REGISTER

FLAG LOGIC

READ POINTER

FF EF

PAF SMODE

OUTPUT REGISTER

READ CONTROL

RCLK

Figure PLCC Top View

D15 D16 D17 GND RCLK REN LD OE RS VCC GND EF VCC Q17 Q16 GND Q15

VCC/SMODE

RCLK

CY7C4425 CY7C4205 CY7C4215 CY7C4225 CY7C4235 CY7C4245
9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
Ordering Information
256 x 18 Synchronous FIFO

Speed ns
Ordering Code

CY7C4205-10AXC

CY7C4205-15AC

CY7C4205-15AXC
512 x 18 Synchronous FIFO

Speed ns
Ordering Code

CY7C4215-15AI

CY7C4215-15AXI
1K x 18 Synchronous FIFO

Speed ns
Ordering Code

CY7C4225-10AI

CY7C4225-10AXI

CY7C4225-15AXC

CY7C4225-15ASC

CY7C4225-15ASXC
2K x 18 Synchronous FIFO

Speed ns
Ordering Code

CY7C4235-15AC

CY7C4235-15AXC
4K x 18 Synchronous FIFO

Speed ns
Ordering Code

CY7C4245-10AXC

CY7C4245-10ASXC

CY7C4245-10AI

CY7C4245-10AXI

CY7C4245-15AXC

CY7C4245-15ASXC

CY7C4245-15JXC

CY7C4425/4205/4215 CY7C4225/4235/4245

Package Name
51-85046
51-85046

Package Type
64-Pin 14 x 14 Thin Quad Flatpack Pb-Free
64-Pin 14 x 14 Thin Quad Flatpack
64-Pin 14 x 14 Thin Quad Flatpack Pb-Free

Package Name
51-85046

Package Type
64-Pin 14 x 14 Thin Quad Flatpack
64-Pin 14 x 14 Thin Quad Flatpack Pb-Free

Package Name
51-85046
51-85046 51-85051

Package Type
64-Pin 14 x 14 Thin Quad Flatpack 64-Pin 14 x 14 Thin Quad Flatpack Pb-Free 64-Pin 14 x 14 Thin Quad Flatpack Pb-Free 64-Pin 10 x 10 Thin Quad Flatpack 64-Pin 10 x 10 Thin Quad Flatpack Pb-Free

Package Name
51-85046

Package Type
64-Pin 14 x 14 Thin Quad Flatpack
64-Pin 14 x 14 Thin Quad Flatpack Pb-Free

Package Name
51-85046 51-85051 51-85046
51-85046 51-85051 51-85005

Package Type
64-Pin 14 x 14 Thin Quad Flatpack Pb-Free 64-Pin 10 x 10 Thin Quad Flatpack Pb-Free 64-Pin 14 x 14 Thin Quad Flatpack 64-Pin 14 x 14 Thin Quad Flatpack Pb-Free 64-Pin 14 x 14 Thin Quad Flatpack Pb-Free 64-Pin 10 x 10 Thin Quad Flatpack Pb-Free 68-Pin Plastic Leaded Chip Carrier Pb-Free

Operating Range

Commercial

Operating Range Industrial

Operating Range Industrial

Commercial
More datasheets: CY7C4205-15AXCT | CY7C4245-15JXCT | CY7C4245-15AXCT | CY7C4245-10AXI | CY7C4245-15ASXC | CY7C4245-10AXCT | CY7C4245-15AXC | CY7C4245-10AXC | CY7C4245-10ASXCT | CY7C4235-15AC


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Datasheet ID: CY7C4245-15JXC 508109