CY7C4265-10AI Cypress Semiconductor Corporation., CY7C4265-10AI Datasheet
CY7C4265-10AI
Available stocks
Related parts for CY7C4265-10AI
CY7C4265-10AI Summary of contents
Page 1
... Features • High-speed, low-power, first-in first-out (FIFO) memories • (CY7C4255) • 16K x 18 (CY7C4265) • 0.5 micron CMOS for optimum speed/power • High-speed 100-MHz operation (10-ns read/write cycle times) • Low power — • Fully asynchronous and simultaneous read and write operation • ...
Page 2
... CMOS technology. Input ESD protection is greater than 2001V, and latch-up is prevented by the use of guard rings. 7C4255/65-10 7C4255/65-15 100 66 0 CY7C4265 16K x18 64-pin TQFP, STQFP CY7C4255 CY7C4265 GND GND ...
Page 3
... HIGH, the FIFO’s outputs are in High Z (high-impedance) state. Dual-Mode Pin: Asynchronous Almost Empty/Almost Full flags – tied to V Synchronous Almost Empty/Almost Full flags – tied to V (Almost Empty synchronized to RCLK, Almost Full synchronized to WCLK.) CY7C4255 CY7C4265 /SMODE is tied ...
Page 4
... IH < V < Com’l 45 Ind 50 Com’l 10 Ind 15 Test Conditions T = 25° MHz 5.0V CC CY7C4255 CY7C4265 [2] Ambient Temperature ± 10% 0°C to +70°C 5V ± 10% –40°C to +85°C 7C42X5-25 7C42X5-35 Max. Min. Max. Min. Max. Unit 2.4 2.4 V 0.4 0.4 ...
Page 5
... [13] 12 /SMODE tied PAF(E) CY7C4255 CY7C4265 ALL INPUT PULSES 90% 90% 10% 10% ≤ 1.91V 7C42X5-25 7C42X5-35 Max. Min. Max. Min. Max. Unit 66.7 40 28.6 MHz ...
Page 6
... Programmable Almost Empty and Program- mable Almost Full Flags (Synchronous Mode only) Document #: 38-06004 Rev. *C 7C42X5-10 7C42X5-15 7C42X5-25 Min. Max. Min. Max. Min. Max. 4.5 6 CY7C4255 CY7C4265 7C42X5-35 Min. Max. Unit Page [+] Feedback ...
Page 7
... NO OPERATION t REF VALID DATA t OE [15] t SKEW2 , then FF may not change state until the next WCLK rising edge. SKEW1 , then EF may not change state until the next RCLK rising edge. SKEW2 CY7C4255 CY7C4265 NO OPERATION t WFF REF t OHZ Page [+] Feedback ...
Page 8
... Document #: 38-06004 Rev RSR t RSF t RSF t RSF [18] t FRL t REF OLZ When t < minimum specification, t CLK SKEW2 SKEW2 CY7C4255 CY7C4265 [17 [19 (maximum) = either 2 FRL CLK SKEW2 Page [+] Feedback ...
Page 9
... Document #: 38-06004 Rev ENS REF REF SKEW2 t A [14 SKEW1 DATA WRITE t WFF t ENS DATA READ CY7C4255 CY7C4265 ENH [18] t FRL t REF D0 NO WRITE DATA WRITE t WFF t ENH t A NEXT DATA READ Page [+] Feedback ...
Page 10
... PAE is offset = n. Number of data words into FIFO already = n. Document #: 38-06004 Rev CLKL t t ENS ENH t HF HALF FULL + 1 OR MORE ENS t CLKL t t ENS ENH t PAE WORDS IN FIFO t PAE t ENS CY7C4255 CY7C4265 HALF FULLOR LESS n WORDS IN FIFO Page [+] Feedback ...
Page 11
... If a read is preformed on this rising edge of the read clock, there will be Empty + (n−1) words in the FIFO when PAE goes LOW. 24. PAF offset = m. Number of data words written into FIFO already = 8192 − for the CY7C4255 and 16384 − for the CY7C4265. ...
Page 12
... PAF ENS ENH t ENS t CLKL t ENH t DH PAF OFFSET , then PAF may not change state until the next WCLK rising edge. SKEW3 CY7C4255 CY7C4265 FULL– M WORDS [26] IN FIFO t [30] PAF synch t SKEW3 t t ENS ENH PAE OFFSET – ...
Page 13
... WXI WCLK Notes: 31. Write to Last Physical Location. 32. Read from Last Physical Location. Document #: 38-06004 Rev CLKL t ENH t A UNKNOWN PAE OFFSET Note Note Note XIS CY7C4255 CY7C4265 PAF OFFSET PAE OFFSET Page [+] Feedback ...
Page 14
... The flags may change state during Retransmit as a result of the offset of the read and write pointers, but flags will be valid at t 35. For the synchronous PAE and PAF flags (SMODE), an appropriate clock cycle is necessary after t Document #: 38-06004 Rev XIS t PRT t RTR . RTR to update these flags. RTR CY7C4255 CY7C4265 Page [+] Feedback ...
Page 15
... When the SMODE pin is tied LOW, the PAF flag signal transition is caused by the rising edge of the write clock and the PAE flag transition is caused by the rising edge of the read clock. CY7C4255 CY7C4265 Selection Writing to offset registers: Empty Offset Full Offset No Operation ...
Page 16
... Notes: 37 Empty Offset (Default Values: CY7C4255/CY7C4265 n = 127). 38 Full Offset (Default Values: CY7C4255/CY7C4265 n = 127). Document #: 38-06004 Rev. *C internal read pointer to the first physical location of the FIFO. WCLK and RCLK may be free running but must be disabled ...
Page 17
... RCLK and WCLK. Figure 1 demonstrates a 36-word width by using two CY7C4255/65s. RESET (RS) 18 7C4255 7C4265 FIRST LOAD (FL) WRITE EXPANSION IN (WXI) READ EXPANSION IN (RXI) CY7C4255 CY7C4265 READ CLOCK (RCLK) READ ENABLE (REN) OUTPUT ENABLE (OE) PROGRAMMABLE (PAF) EMPTY FLAG (EF) EF DATA OUT ( Page [+] Feedback ...
Page 18
... PAF PAE WXI RXI WXO RXO 7C4255 7C4265 PAF PAE WXI RXI READ CLOCK(RCLK) WXO RXO READ ENABLE(REN) 7C4255 7C4265 OUTPUT ENABLE(OE PAE PAF WXI RXI CY7C4255 CY7C4265 DATA OUT (Q) EF PAE Page [+] Feedback ...
Page 19
... NORMALIZED t vs. SUPPLY A TEMPERATURE 1.60 1.40 1.20 1. 25° 5.0V 0. 0.60 −55.00 5.00 5.50 6.00 5.00 AMBIENT TEMPERATURE (°C) NORMALIZED SUPPLY CURRENT vs. AMBIENT TEMPERATURE 1.20 1.10 1. 3. MHz 0.80 −55.00 5.00 65.00 125.00 AMBIENT TEMPERATURE (°C) CY7C4255 CY7C4265 vs. AMBIENT A 65.00 125.00 NORMALIZED SUPPLY CURRENT vs. FREQUENCY 1.75 1.50 1.25 1. 5.0V 0. 25° 3.0V IN 0.50 20.00 30.00 40.00 50.00 60.00 FREQUENCY (MHz) Page [+] Feedback ...
Page 20
... CY7C4265–10AC CY7C4265–10ASC CY7C4265–10ASXC CY7C4265–10AI CY7C4265–10AXI 15 CY7C4265–15AC CY7C4265–15AXC CY7C4265-15ASC Package Diagrams 64-Pin Thin Plastic Quad Flat Pack ( 1.4 mm) A64 64-Pin Pb-Free Thin Plastic Quad Flat Pack ( 1.4 mm) A64 Document #: 38-06004 Rev. *C Package Package ...
Page 21
... The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. CY7C4255 CY7C4265 51-85046-*B Page ...
Page 22
... Document History Page Document Title: CY7C4255, CY7C4265 8K/16K X 18 Deep Sync FIFOs Document Number: 38-06004 Issue Orig. of REV. ECN NO. Date Change ** 106465 07/11/01 *A 122257 12/26/02 *B 252889 See ECN *C 385985 See ECN Document #: 38-06004 Rev. *C Description of Change SZV Change from Spec Number: 38-00468 to 38-06004 ...