CY7C419/21/25/29/33256/512/1K/2K/4K x 9 Asynchronous FIFO CY7C419/21/25/29/33 256/512/1K/2K/4K x 9 Asynchronous FIFO Features Functional Description ■ Asynchronous first-in first-out (FIFO) buffer memories ■ 256 x 9 (CY7C419) ■ 512 x 9 (CY7C421) ■ 1K x 9 (CY7C425) ■ 2K x 9 (CY7C429) ■ 4K x 9 (CY7C433) ■ Dual-ported RAM cell ■ High speed 50 MHz read and write independent of depth and width ■ Low operating power: ICC = 35 mA ■ Empty and full flags (Half Full flag in standalone) ■ TTL compatible ■ Retransmit in standalone ■ Expandable in width ■ PLCC, 7x7 TQFP, SOJ, 300-mil, and 600-mil DIP ■ Pb-free packages available ■ Pin compatible and functionally equivalent to IDT7200, IDT7201, IDT7202, IDT7203, IDT7204, AM7200, AM7201, AM7202, AM7203, and AM7204 The CY7C419, CY7C420/1, CY7C424/5, CY7C428/9, and CY7C432/3 are first-in first-out (FIFO) memories offered in 600-mil wide and 300-mil wide packages. There are 256, 512, 1,024, 2,048, and 4,096 words respectively by 9 bits wide. Each FIFO memory is organized such that the data is read in the same sequential order that it was written. Full and empty flags are provided to prevent overrun and underrun. Three additional pins are also provided to facilitate unlimited expansion in width, depth, or both. The depth expansion technique steers the control signals from one device to another in parallel. This eliminates the serial addition of propagation delays, so that throughput is not reduced. Data is steered in a similar manner. The read and write operations may be asynchronous; each can occur at a rate of 50 MHz. The write operation occurs when the write (W) signal is LOW. Read occurs when read (R) goes LOW. The nine data outputs go to the high impedance state when R is HIGH. A Half Full (HF) output flag that is valid in the standalone and width expansion configurations is provided. In the depth expansion configuration, this pin provides the expansion out (XO) information that is used to tell the next FIFO that it is activated. In the standalone and width expansion configurations, a LOW on the retransmit (RT) input causes the FIFOs to retransmit the data. Read enable (R) and write enable (W) must both be HIGH during retransmit, and then R is used to access the data. The CY7C419, CY7C420, CY7C421, CY7C424, CY7C425, CY7C428, CY7C429, CY7C432, and CY7C433 are fabricated using an advanced 0.65-micron P-well CMOS technology. Input ESD protection is greater than 2000V and latch-up is prevented by careful layout and guard rings. Logic Block Diagram Cypress Semiconductor Corporation Document #: 38-06001 Rev. *C • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600 Revised December 09, 2008 [+] Feedback CY7C419/21/25/29/33 Pin Configurations Figure 3. 32-PIn TQFP Figure 1. 32-Pin PLCC/LCC Figure 2. 28-Pin DIP Table 1. Selection Guide 4K x 9 –10 –15 –20 –25 –30 –40 –65 Frequency (MHz) 50 40 33.3 28.5 25 20 12.5 Maximum Access Time (ns) 10 15 20 25 30 40 65 ICC1 (mA) 35 35 35 35 35 35 35 Document #: 38-06001 Rev. *C Page 2 of 17 [+] Feedback CY7C419/21/25/29/33 Maximum Rating Output Current, into Outputs (LOW)............................ 20 mA Exceeding maximum ratings may impair the useful life of the device. These user guidelines are not tested.[1] Static Discharge Voltage............................................ >2000V (per MIL–STD–883, Method 3015) Storage Temperature ................................. –65°C to +150°C Latch-Up Current ..................................................... >200 mA Ambient Temperature with Power Applied.. –55°C to +125°C Supply Voltage to Ground Potential................–0.5V to +7.0V DC Voltage Applied to Outputs in High Z State ................................................–0.5V to +7.0V Operating Range Range Commercial Industrial Ambient Temperature[2] VCC 0°C to + 70°C 5V ± 10% –40°C to +85°C 5V ± 10% DC Input Voltage ............................................–0.5V to +7.0V Power Dissipation.......................................................... 1.0W Electrical Characteristics Over the Operating Range[3] Parameter Description VOH VOL VIH Output HIGH Voltage Output LOW Voltage Input HIGH Voltage VIL IIX IOZ IOS Input LOW Voltage Input Leakage Current Output Leakage Current Output Short Circuit Current[5] Test Conditions VCC = Min., IOH = –2.0 mA VCC = Min., IOL = 8.0 mA Commercial Industrial All Speed Grades Min 2.4 2.0 2.2 [4] GND < VI < VCC R > VIH, GND < VO < VCC VCC = Max., VOUT = GND Max –10 –10 0.4 VCC VCC 0.8 +10 +10 –90 Unit V V V V μA μA mA Notes 1. Single Power Supply: The voltage on any input or I/O pin can not exceed the power pin during power-up. 2. TA is the “instant on” case temperature. 3. See the last page of this specification for Group A subgroup testing information. 4. VIL (Min.) = –2.0V for pulse durations of less than 20 ns. 5. For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds. Document #: 38-06001 Rev. *C Page 3 of 17 [+] Feedback CY7C419/21/25/29/33 Electrical Characteristics Over the Operating Range Parameter Description Test Conditions ICC Operating Current VCC = Max., IOUT = 0 mA f = fMAX VCC = Max., IOUT = 0 mA F = 20 MHz All Inputs = VIH Min. ICC1 Operating Current ISB1 Standby Current ISB2 Power-Down Current All Inputs > VCC –0.2V –10 Min –15 Max 85 Commercial Industrial Min –20 Max 65 100 Min –25 Max 55 90 Min Max 50 80 Unit mA Commercial 35 35 35 35 mA Commercial Industrial Commercial Industrial 10 10 15 5 8 10 15 5 8 10 15 5 8 mA 5 mA Electrical Characteristics Over the Operating Range[3] Parameter Description Test Conditions ICC Operating Current VCC = Max., IOUT = 0 mA f = fMAX VCC = Max., IOUT = 0 mA F = 20 MHz All Inputs = VIH Min. ICC1 Operating Current ISB1 Standby Current ISB2 Power-Down Current All Inputs > VCC –0.2V –30 Min –40 Min –65 Max 35 70 Min Max 35 65 Unit Commercial Industrial Max 40 75 Commercial 35 35 35 mA Commercial Industrial Commercial Industrial 10 15 5 8 10 15 5 8 10 15 5 8 mA mA mA Capacitance[6] Parameter CIN COUT Description Input Capacitance Output Capacitance Test Conditions TA = 25°C, f = 1 MHz, VCC = 4.5V Max 6 6 Unit pF pF Note 6. Tested initially and after any design or process changes that may affect these parameters. Document #: 38-06001 Rev. *C Page 4 of 17 [+] Feedback CY7C419/21/25/29/33 Switching Characteristics Over the Operating Range[7, 8] Parameter tRC tA tRR tPR tLZR[6,9] tDVR[9,10] tHZR[6,9,10] tWC tPW tHWZ[6,9] tWR tSD tHD tMRSC tPMR tRMR tRPW tWPW tRTC tPRT tRTR tEFL tHFH tFFH tREF tRFF tWEF tWFF tWHF tRHF tRAE tRPE tWAF tWPF tXOL tXOH Description Read Cycle Time Access Time Read Recovery Time Read Pulse Width Read LOW to Low Z Data Valid After Read HIGH Read HIGH to High Z Write Cycle Time Write Pulse Width Write HIGH to Low Z Write Recovery Time Data Set-Up Time Data Hold Time MR Cycle Time MR Pulse Width MR Recovery Time Read HIGH to MR HIGH Write HIGH to MR HIGH Retransmit Cycle Time Retransmit Pulse Width Retransmit Recovery Time MR to EF LOW MR to HF HIGH MR to FF HIGH Read LOW to EF LOW Read HIGH to FF HIGH Write HIGH to EF HIGH Write LOW to FF LOW Write LOW to HF LOW Read HIGH to HF HIGH Effective Read from Write HIGH Effective Read Pulse Width After EF HIGH Effective Write from Read HIGH Effective Write Pulse Width After FF HIGH Expansion Out LOW Delay from Clock Expansion Out HIGH Delay from Clock –10 Min 20 –15 Max Min 25 10 10 10 3 5 –20 Max 15 10 15 3 5 15 20 10 5 10 6 0 20 10 10 10 10 20 10 10 15 10 10 10 30 30 30 20 20 20 20 20 20 20 35 35 35 25 25 25 25 25 25 25 25 20 20 15 15 18 35 25 5 10 15 0 35 25 10 25 25 35 25 10 20 15 25 15 15 Max 10 25 3 5 30 20 5 10 12 0 30 20 10 20 20 30 20 10 25 25 25 15 15 15 15 15 15 15 10 Min 35 20 15 20 20 20 10 10 10 10 10 10 10 –25 Max 10 20 3 5 25 15 5 10 8 0 25 15 10 15 15 25 15 10 10 Min 30 25 25 20 20 25 25 Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Notes 7. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V and output loading of the specified IOL/IOH and 30 pF load capacitance, as in part (a) of AC Test Load and Waveforms, unless otherwise specified. 8. See the last page of this specification for Group A subgroup testing information. 9. tHZR transition is measured at +200 mV from VOL and –200 mV from VOH. tDVR transition is measured at the 1.5V level. tHWZ and tLZR transition is measured at ±100 mV from the steady state. 10. tHZR and tDVR use capacitance loading as in part (b) of AC Test Load and Waveforms. Document #: 38-06001 Rev. *C Page 5 of 17 [+] Feedback CY7C419/21/25/29/33 Switching Characteristics Over the Operating Range[7, 8] (continued) Parameter Description –30 Min –40 Max –65 Max Max Read Cycle Time Access Time tRR Read Recovery Time 10 10 15 ns tPR Read Pulse Width 30 40 65 ns Read LOW to Low Z 3 3 3 ns Data Valid After Read HIGH 5 5 5 ns tDVR[9,10] tHZR [6,9,10] 30 Read HIGH to High Z 80 Unit tA tLZR 50 Min tRC [6,9] 40 Min 40 20 ns 65 20 20 ns ns tWC Write Cycle Time 40 50 80 ns tPW Write Pulse Width 30 40 65 ns tHWZ[6,9] Write HIGH to Low Z 5 5 5 ns tWR Write Recovery Time 10 10 15 ns tSD Data Set-Up Time 18 20 30 ns tHD Data Hold Time 0 0 0 ns tMRSC MR Cycle Time 40 50 80 ns tPMR MR Pulse Width 30 40 65 ns tRMR MR Recovery Time 10 10 15 ns tRPW Read HIGH to MR HIGH 30 40 65 ns tWPW Write HIGH to MR HIGH 30 40 65 ns tRTC Retransmit Cycle Time 40 50 80 ns tPRT Retransmit Pulse Width 30 40 65 ns tRTR Retransmit Recovery Time 10 tEFL MR to EF LOW 40 50 80 ns tHFH MR to HF HIGH 40 50 80 ns tFFH MR to FF HIGH 40 50 80 ns tREF Read LOW to EF LOW 30 35 60 ns tRFF Read HIGH to FF HIGH 30 35 60 ns tWEF Write HIGH to EF HIGH 30 35 60 ns tWFF Write LOW to FF LOW 30 35 60 ns tWHF Write LOW to HF LOW 30 35 60 ns tRHF Read HIGH to HF HIGH 30 35 60 ns tRAE Effective Read from Write HIGH 60 ns tRPE Effective Read Pulse Width After EF HIGH tWAF Effective Write from Read HIGH tWPF Effective Write Pulse Width After FF HIGH tXOL Expansion Out LOW Delay from Clock 30 40 65 ns tXOH Expansion Out HIGH Delay from Clock 30 40 65 ns Document #: 38-06001 Rev. *C 10 30 30 15 35 40 30 30 ns 65 35 40 ns 60 65 ns ns Page 6 of 17 [+] Feedback CY7C419/21/25/29/33 Switching Waveforms Figure 4. Asynchronous Read and Write tA R tRC tPR tA tRR tLZR tDVR tHZR DATA VALID Q0–Q 8 tPW tWC DATA VALID tWR W tSD tHD DATA VALID D0–D 8 DATA VALID Figure 5. Master Reset tMRSC [12] tPMR MR R, W [11] tRPW tWPW tEFL tRMR EF tHFH HF tFFH FF Figure 6. Half-full Flag HALF FULL HALF FULL+1 HALF FULL W tRHF R tWHF HF Notes 11. W and R ≥ VIH around the rising edge of MR 12. tMRSC = tPMR + tRMR. Document #: 38-06001 Rev. *C Page 7 of 17 [+] Feedback CY7C419/21/25/29/33 Switching Waveforms (continued) Figure 7. Last Write to First Read Full Flag R LAST WRITE FIRST READ ADDITIONAL READS FIRST WRITE W tRFF tWFF FF Figure 8. Last Read to First Write Empty Flag W LAST READ FIRST WRITE ADDITIONAL WRITES FIRST READ R tWEF tREF EF tA DATA OUT VALID VALID Figure 9. Retransmit[13] tRTC[14] FL/RT tPRT R,W tRTR Notes 13. EF, HF and FF may change state during retransmit as a result of the offset of the read and write pointers, but flags will be valid at tRTC. 14. tRTC = tPRT + tRTR. Document #: 38-06001 Rev. *C Page 8 of 17 [+] Feedback CY7C419/21/25/29/33 Switching Waveforms (continued) Figure 10. Empty Flag and Read Data Flow-through Mode DATA IN W tRAE R tREF EF tWEF tHWZ tRPE tA DATA OUT DATA VALID Figure 11. Full Flag and Write Data Flow-through Mode R tWAF tWPF W tRFF tWFF FF tHD DATA IN DATA VALID tA DATA OUT Document #: 38-06001 Rev. *C tSD DATA VALID Page 9 of 17 [+] Feedback CY7C419/21/25/29/33 Switching Waveforms (continued) Figure 12. Expansion Timing Diagrams WRITE TO LAST PHYSICAL LOCATION OF DEVICE 1 WRITE TO FIRST PHYSICAL LOCATION OF DEVICE 2 W tWR tXOL XO1(XI2)[15] tXOH tSD tHD DATA VALID D0–D 8 READ FROM LAST PHYSICAL LOCATION OF DEVICE 1 tHD tSD DATA VALID READ FROM FIRST PHYSICAL LOCATION OF DEVICE 2 R tRR tXOL [15] tXOH XO1(XI2) tHZR tLZR tDVR tDVR DATA VALID Q0–Q 8 tA DATA VALID tA Note 15. Expansion Out of device 1 (XO1) is connected to Expansion In of device 2 (XI2) Document #: 38-06001 Rev. *C Page 10 of 17 [+] Feedback CY7C419/21/25/29/33 Architecture The CY7C419, CY7C420/1, CY7C424/5, CY7C428/9, CY7C432/3 FIFOs consist of an array of 256, 512, 1024, 2048, 4096 words of 9 bits each (implemented by an array of dual-port RAM cells), a read pointer, a write pointer, control signals (W, R, XI, XO, FL, RT, MR), and Full, Half Full, and Empty flags. The retransmit feature is beneficial when transferring packets of data. It enables the receiver to acknowledge receipt of data and retransmit, if necessary. The dual-port RAM architecture refers to the basic memory cell used in the RAM. The cell itself enables the read and write operations to be independent of each other, which is necessary to achieve truly asynchronous operation of the inputs and outputs. A second benefit is that the time required to increment the read and write pointers is much less than the time required for data propagation through the memory, which is the case if memory is implemented using the conventional register array architecture. The Retransmit (RT) input is active in the standalone and width expansion modes. The retransmit feature is intended for use when a number of writes equal to or less than the depth of the FIFO have occurred since the last MR cycle. A LOW pulse on RT resets the internal read pointer to the first physical location of the FIFO. R and W must both be HIGH while and tRTR after retransmit is LOW. With every read cycle after retransmit, previously accessed data and not previously accessed data is read and the read pointer is incremented until it is equal to the write pointer. Full, Half Full, and Empty flags are governed by the relative locations of the read and write pointers and are updated during a retransmit cycle. Data written to the FIFO after activation of RT are also transmitted. FIFO, up to the full depth, can be repeatedly retransmitted. Resetting the FIFO Standalone/Width Expansion Modes Upon power up, the FIFO must be reset with a Master Reset (MR) cycle. This causes the FIFO to enter the empty condition signified by the Empty flag (EF) being LOW, and both the Half Full (HF) and Full flags (FF) being HIGH. Read (R) and write (W) must be HIGH tRPW/tWPW before and tRMR after the rising edge of MR for a valid reset cycle. If reading from the FIFO after a reset cycle is attempted, the outputs are in the high impedance state. Standalone and width expansion modes are set by grounding Expansion In (XI) and tying First Load (FL) to VCC. FIFOs can be expanded in width to provide word widths greater than nine in increments of nine. During width expansion mode, all control line inputs are common to all devices, and flag outputs from any device can be monitored. Dual-Port RAM Writing Data to the FIFO The availability of at least one empty location is indicated by a HIGH FF. The falling edge of W initiates a write cycle. Data appearing at the inputs (D0–D8) tSD before and tHD after the rising edge of W will be stored sequentially in the FIFO. The EF LOW-to-HIGH transition occurs tWEF after the first LOW-to-HIGH transition of W for an empty FIFO. HF goes LOW tWHF after the falling edge of W following the FIFO actually being Half Full. Therefore, the HF is active once the FIFO is filled to half its capacity plus one word. HF will remain LOW while less than one half of total memory is available for writing. The LOW-to-HIGH transition of HF occurs tRHF after the rising edge of R when the FIFO goes from half full +1 to half full. HF is available in standalone and width expansion modes. FF goes LOW tWFF after the falling edge of W, during the cycle in which the last available location is filled. Internal logic prevents overrunning a full FIFO. Writes to a full FIFO are ignored and the write pointer is not incremented. FF goes HIGH tRFF after a read from a full FIFO. Reading Data from the FIFO The falling edge of R initiates a read cycle if the EF is not LOW. Data outputs (Q0 to Q8) are in a high impedance condition between read operations (R HIGH), when the FIFO is empty, or when the FIFO is not the active device in the depth expansion mode. When one word is in the FIFO, the falling edge of R initiates a HIGH-to-LOW transition of EF. The rising edge of R causes the data outputs to go to the high impedance state and remain such until a write is performed. Reads to an empty FIFO are ignored and do not increment the read pointer. From the empty condition, the FIFO can be read tWEF after a valid write. Document #: 38-06001 Rev. *C Depth Expansion Mode Depth expansion mode (see Figure 13 on page 12) is entered when, during a MR cycle, Expansion Out (XO) of one device is connected to Expansion In (XI) of the next device, with XO of the last device connected to XI of the first device. In the depth expansion mode the First Load (FL) input, when grounded, indicates that this part is the first to be loaded. All other devices must have this pin HIGH. To enable the correct FIFO, XO is pulsed LOW when the last physical location of the previous FIFO is written to and pulsed LOW again when the last physical location is read. Only one FIFO is enabled for read and one for write at any given time. All other devices are in standby. FIFOs can also be expanded simultaneously in depth and width. Consequently, any depth or width FIFO can be created of word widths in increments of 9. When expanding in depth, a composite FF must be created by ORing the FFs together. Likewise, a composite EF is created by ORing the EFs together. HF and RT functions are not available in depth expansion mode. Use of the Empty and Full Flags To achieve maximum frequency, the flags must be valid at the beginning of the next cycle. However, because they can be updated by either edge of the read or write signal, they must be valid by one-half of a cycle. Cypress FIFOs meet this requirement; some competitors’ FIFOs do not. The reason for why the flags should be valid by the next cycle is complex. The “effective pulse width violation” phenomenon can occur at the full and empty boundary conditions, if the flags are not properly used. The empty flag must be used to prevent reading from an empty FIFO and the full flag must be used to prevent writing into a full FIFO. For example, consider an empty FIFO that is receiving read pulses. Because the FIFO is empty, the read pulses are ignored by the FIFO, and nothing happens. Next, a single word is written Page 11 of 17 [+] Feedback CY7C419/21/25/29/33 Similarly, the minimum write pulse width may be violated by trying to write into a full FIFO, and asynchronously performing a read. The empty and full flags are used to avoid these effective pulse width violations, but to do this and operate at the maximum frequency, the flag must be valid at the beginning of the next cycle. into the FIFO, with a signal that is asynchronous to the read signal. The (internal) state machine in the FIFO goes from empty to empty+1. However, it does this asynchronously with respect to the read signal, so that the effective pulse width of the read signal cannot be determined, because the state machine does not look at the read signal until it goes to the empty+1 state. Figure 13. Depth Expansion XO R W FF 9 EF CY7C419 CY7C420/1 CY7C424/5 CY7C428/9 CY7C432/3 9 D 9 Q FL VCC XI XO FULL FF EF CY7C419 CY7C420/1 CY7C424/5 CY7C428/9 CY7C432/3 9 EMPTY FL XI XO * FF 9 MR CY7C419 CY7C420/1 CY7C424/5 CY7C428/9 CY7C432/3 EF FL XI * FIRST DEVICE Document #: 38-06001 Rev. *C Page 12 of 17 [+] Feedback CY7C419/21/25/29/33 Ordering Information Speed (ns) 10 15 20 25 30 40 65 Ordering Code Package Type Package Type Operating Range CY7C421–10AC A32 32-Pin Thin Plastic Quad Flatpack CY7C421–10JC J65 32-Pin Plastic Leaded Chip Carrier CY7C421–10JXC J65 32-Pin Pb-Free Plastic Leaded Chip Carriers CY7C421–10PC P21 28-Pin (300-Mil) Molded DIP CY7C421–10VC V21 28-Pin (300-Mil) Molded SOJ CY7C421–15AC A32 32-Pin Thin Plastic Quad Flatpack CY7C421–15AXC A32 32-Pin Pb-Free Thin Plastic Quad Flatpack CY7C421–15JC J65 32-Pin Plastic Leaded Chip Carrier CY7C421–15JI J65 32-Pin Plastic Leaded Chip Carrier CY7C421–15VI V21 28-Pin (300-Mil) Molded SOJ CY7C421–20JC J65 32-Pin Plastic Leaded Chip Carrier CY7C421–20JXC J65 32-Pin Pb-Free Plastic Leaded Chip Carriers CY7C421–20PC P21 28-Pin (300-Mil) Molded DIP CY7C421–20VC V21 28-Pin (300-Mil) Molded SOJ CY7C421–20VXC V21 28-Pin (300-Mil) Pb-Free Molded SOJ CY7C421–20JI J65 32-Pin Plastic Leaded Chip Carrier CY7C421–20JXI J65 32-Pin Plastic Leaded Chip Carrier CY7C421–25JC J65 32-Pin Plastic Leaded Chip Carrier CY7C421–25PC P21 28-Pin (300-Mil) Molded DIP CY7C421–25VC V21 28-Pin (300-Mil) Molded SOJ CY7C421–25JI J65 32-Pin Plastic Leaded Chip Carrier CY7C421–25PI P21 28-Pin (300-Mil) Molded DIP CY7C421–30JC J65 32-Pin Plastic Leaded Chip Carrier CY7C421–30PC P21 28-Pin (300-Mil) Molded DIP CY7C421–30JI J65 32-Pin Plastic Leaded Chip Carrier Industrial CY7C421–40JC J65 32-Pin Plastic Leaded Chip Carrier Commercial CY7C421–40PC P21 28-Pin (300-Mil) Molded DIP CY7C421–40VC V21 28-Pin (300-Mil) Molded SOJ CY7C421–40JI J65 32-Pin Plastic Leaded Chip Carrier Industrial CY7C421–65JC J65 32-Pin Plastic Leaded Chip Carrier Commercial CY7C421–65PC P21 28-Pin (300-Mil) Molded DIP CY7C421–65VC V21 28-Pin (300-Mil) Molded SOJ CY7C421–65JI J65 32-Pin Plastic Leaded Chip Carrier Document #: 38-06001 Rev. *C Commercial Commercial Industrial Commercial Industrial Commercial Industrial Commercial Industrial Page 13 of 17 [+] Feedback CY7C419/21/25/29/33 Package Diagrams Figure 14. 32-Pin Thin Plastic Quad Flat Pack A32 (51-85063) 51-85063-*B Figure 15. 32-Pin Plastic Leaded Chip Carrier J65 (51-85002) 51-85002-*B Document #: 38-06001 Rev. *C Page 14 of 17 [+] Feedback CY7C419/21/25/29/33 Package Diagrams (continued) Figure 16. 28-Pin (300-Mil) PDIP P21 (51-85014) SEE LEAD END OPTION 14 1 DIMENSIONS IN INCHES [MM] MIN. MAX. REFERENCE JEDEC MO-095 0.260[6.60] 0.295[7.49] 15 PACKAGE WEIGHT: 2.15 gms 28 0.030[0.76] 0.080[2.03] SEATING PLANE 1.345[34.16] 1.385[35.18] 0.290[7.36] 0.325[8.25] 0.120[3.05] 0.140[3.55] 0.140[3.55] 0.190[4.82] 0.115[2.92] 0.160[4.06] 0.015[0.38] 0.060[1.52] 0.090[2.28] 0.110[2.79] 0.009[0.23] 0.012[0.30] 0.055[1.39] 0.065[1.65] 3° MIN. 0.310[7.87] 0.385[9.78] 0.015[0.38] 0.020[0.50] SEE LEAD END OPTION LEAD END OPTION (LEAD #1, 14, 15 & 28) 51-85014-*D Document #: 38-06001 Rev. *C Page 15 of 17 [+] Feedback CY7C419/21/25/29/33 Package Diagrams (continued) Figure 17. 28-Pin (300-Mil) Molded SOJ V21(51-85031) 51-85031-*C Document #: 38-06001 Rev. *C Page 16 of 17 [+] Feedback CY7C419/21/25/29/33 Document History Page Document Title: CY7C419, CY7C421, CY7C425, CY7C429, CY7C433, 256/512/1K/2K/4Kx9 Asynchronous FIFO Document Number: 38-06001 Rev. ECN No. Orig. of Change Submission Date SZV 07/11/01 Description of Change ** 106462 *A 122332 RBI 12/30/02 Added power up requirements to maximum ratings information. *B 383597 PCX See ECN Added Pb-Free Logo Added to Part-Ordering Information: CY7C419–10JXC, CY7C419–15JXC, CY7C419-15VXC, CY7C421–10JXC, CY7C421–15AXC, CY7C421–20JXC, CY7C421–20VXC, CY7C425–10AXC, CY7C425–10JXC, CY7C425–15JXC, CY7C425–20JXC, CY7C425–20VXC, CY7C429–10AXC, CY7C429–15JXC, CY7C429–20JXC, CY7C433–10AXC, CY7C433–10JXC, CY7C433–15JXC, CY7C433–20AXC, CY7C433–20JXC VKN/PYRS 12/17/08 Added CY7C421-20JXI Removed CY7C419/25/29/33 from the ordering information table Removed 26-Lead CerDIP, 32-Lead RLCC, 28-Lead molded DIP packages from the data sheet Removed Military Information *C 2623658 Change from Spec Number: 38-00079 to 38-06001 Sales, Solutions and Legal Information Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at cypress.com/sales. Products PSoC Clocks & Buffers PSoC Solutions psoc.cypress.com clocks.cypress.com General Low Power/Low Voltage psoc.cypress.com/solutions psoc.cypress.com/low-power Wireless wireless.cypress.com Precision Analog Memories memory.cypress.com LCD Drive psoc.cypress.com/lcd-drive image.cypress.com CAN 2.0b psoc.cypress.com/can USB psoc.cypress.com/usb Image Sensors psoc.cypress.com/precision-analog © Cypress Semiconductor Corporation, 2005-2008. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. 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. Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign), United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without the express written permission of Cypress. Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. Use may be limited by and subject to the applicable Cypress software license agreement. Document #: 38-06001 Rev. *C Revised December 09, 2008 All products and company names mentioned in this document may be the trademarks of their respective holders. Page 17 of 17 [+] Feedback