CY7C182 8Kx9 Static RAM Features The CY7C182, which is oriented toward cache memory applications, features fully static operation requiring no external clocks or timing strobes. The automatic power-down feature reduces the power consumption by more than 70% when the circuit is deselected. Easy memory expansion is provided by an active-LOW Chip Enable (CE1), an active HIGH Chip Enable (CE2), an active-LOW Output Enable (OE), and threestate drivers. • High speed — tAA = 25 ns • x9 organization is ideal for cache memory applications • CMOS for optimum speed/power • Low active power — 770 mW • Low standby power — 195 mW • TTL-compatible inputs and outputs • Automatic power-down when deselected • Easy memory expansion with CE1, CE2, OE options An active-LOW Write Enable signal (WE) controls the writing/reading operation of the memory. When CE1 and WE inputs are both LOW, data on the nine data input/output pins (I/O0 through I/O8) is written into the memory location addressed by the address present on the address pins (A0 through A12). Reading the device is accomplished by selecting the device and enabling the outputs, (CE1 and OE active LOW and CE2 active HIGH), while (WE) remains inactive or HIGH. Under these conditions, the contents of the location addressed by the information on address pins is present on the nine data input/output pins. Functional Description The CY7C182 is a high-speed CMOS static RAM organized as 8,192 by 9 bits and it is manufactured using Cypress’s highperformance CMOS technology. Access times as fast as 25 ns are available with maximum power consumption of only 770 mW. The input/output pins remain in a high-impedance state unless the chip is selected, outputs are enabled, and write enable (WE) is HIGH. A die coat is used to insure alpha immunity. Logic Block Diagram Pin Configuration DIP/SOJ Top View 256 x 32 x 9 ARRAY 1 28 V CC I/O0 A5 2 27 WE A6 3 26 CE 2 I/O1 A7 4 25 A3 A8 5 24 A2 A9 6 23 A1 A 10 7 22 OE A 11 8 21 A0 A 12 9 20 CE 1 I/O 0 10 19 I/O 8 I/O 1 11 18 I/O 7 I/O 2 12 17 I/O 6 I/O 3 13 16 I/O 5 GND 14 15 I/O 4 I/O2 SENSE AMPS A1 A2 A3 A4 A5 A6 A7 A8 ROW DECODER INPUT BUFFER A4 I/O3 I/O4 I/O5 I/O6 CE1 CE2 WE POWER DOWN COLUMN DECODER I/O8 A12 A11 A10 OE A0 A9 C182–2 I/O7 C182–1 Selection Guide 7C182-25 7C182-35 7C182-45 Maximum Access Time (ns) 25 35 45 Maximum Operating Current (mA) 140 140 140 Maximum Standby Current (mA) 35 35 35 Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600 October 4, 1999 CY7C182 Output Current into Outputs (LOW)............................. 20 mA Maximum Ratings Static Discharge Voltage .......................................... >2001V (per MIL-STD-883, Method 3015.2) (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature .....................................−65°C to +150°C Latch-Up Current .................................................... >200 mA Ambient Temperature with Power Applied ..................................................−55°C to +125°C Operating Range Supply Voltage to Ground Potential[1] ..............−0.5V to +7.0V Range Ambient Temperature VCC DC Voltage Applied to Outputs in High Z State[1] .................................................−0.5V to +7.0V Commercial 0°C to + 70°C 5V ± 10% DC Input Voltage[1] ..............................................−0.5V to +7.0V Electrical Characteristics Over the Operating Range 7C182-25, 35, 45 Parameter Description Test Conditions VOH Output HIGH Voltage VCC Min., IOH = −4.0 mA. VOL Output LOW Voltage VCC Min., IOL = 8.0 mA VIH Input HIGH Voltage VIL Input LOW Voltage[1] IIX Input Load Current GND < VIN < VCC, GND < VOUT < VCC, Output Disabled IOZ Output Leakage Current VCC = Max., VOUT = GND IOS Output Short Circuit Current[2] ICC Min. Max. Unit 2.4 V 0.4 V 2.2 VCC V −0.5 0.8 V −10 +10 µA −10 +10 µA VCC = Max., VOUT = GND −300 mA VCC Operating Circuit Current VCC Max., Output Current = 0 mA, f = Max., V IN = VCC or GND 140 mA Automatic Power-Down Current — TTL Inputs Max V CC, CE1 > VIH, CE2 < VIL, VIN > VIH or VIN < VIL, f = fMAX 35 mA Automatic Power-Down Current — CMOS Inputs Max V CC, CE1 > VCC − 0.3V, CE2 < 0.3V, VIN > VCC − 0.3V or VIN < 0.3V, f = 0 20 mA Capacitance[3] Parameter Description COUT Output Capacitance CIN Input Capacitance Test Conditions TA = 25°C, f = 1 MHz, VCC = 5.0V Max. Unit 10 pF 10 pF Note: 1. 2. 3. VIL (min.) = −3.0V for pulse durations of less than 20 ns. Duration of the short circuit should not exceed 30 seconds. Not more than one output should be shorted at one time. Tested initially and after any design or process changes that may affect these parameters. AC Test Loads and Waveforms R1 481Ω R1 481Ω 5V OUTPUT 5V OUTPUT R2 255Ω 30 pF INCLUDING JIG AND SCOPE 3.0V INCLUDING JIG AND SCOPE (a) Equivalent to: R2 255Ω 5 pF C182–3 (b) THÉVENIN EQUIVALENT 167Ω OUTPUT 1.73V 2 GND 10% < 5 ns ALL INPUT PULSES 90% 90% 10% < 5 ns C182–4 CY7C182 Switching Characteristics Over the Operating Range 7C182-25 Parameter Description Min. Max. 7C182-35 Min. Max. 7C182-45 Min. Max. Unit [4] READ CYCLE tRC Read Cycle Time tAA Address to Data Valid tOHA Data Hold from Address Change tACE1 CE1 Access Time 25 35 45 ns tACE2 CE2 Access Time 25 35 45 ns tLZCE1 CE1 LOW to Low Z 5 5 5 ns tLZCE2 CE2 HIGH to Low Z 5 5 5 ns tHZCE1 25 35 25 3 [5] CE1 HIGH to High Z [5] 45 35 3 ns 45 3 ns ns 18 20 25 18 20 25 ns tHZCE2 CE2 LOW to High Z tPU CE1 LOW to Power-Up tPD CE1 HIGH to Power-Down 20 20 25 ns tDOE OE Access Time 18 20 20 ns tLZOE OE LOW to Low Z tHZOE OE HIGH to High Z 0 0 3 [5] 0 3 18 ns 3 20 ns 25 ns WRITE CYCLE[6] tWC Write Cycle Time 25 35 45 ns tSA Address Set-Up Time 0 0 0 ns tAW Address Valid to End of Write 20 30 40 ns tSD Data Set-Up Time 15 20 25 ns tSCE1 CE1 LOW to Write End 20 30 40 ns tSCE2 CE2 HIGH to Write End 20 30 40 ns tPWE WE Pulse Width 20 25 30 ns tHA Address Hold from End of Write 0 0 0 ns tHD Data Hold Time 0 0 0 ns 3 3 3 ns tLZWE tHZWE Write HIGH to Low Z [7] Write LOW to High Z [5, 7, 8] 13 15 20 ns Notes: 4. WE is HIGH for read cycle. 5. t HZCE and t HZWE are specified with CL = 5 pF. Transition is measured ± 500 mV from steady-state voltage. 6. The internal write time of the memory is defined by the overlap of CE1 LOW, CE2 HIGH, and WE LOW. All three signals must be asserted to initiate a write and any signal can terminate a write by being deasserted. The data input set-up and hold timing should be referenced to the rising edge of the signal that terminates the write. 7. At any given temperature and voltage condition, tLZWE is less than t HZWE for any given device. These parameters are sampled and not 100% tested. 8. Address valid prior to or coincident with CE transition LOW and CE2 transition HIGH. 3 CY7C182 Switching Waveforms Read Cycle No. 1[4, 9] tRC ADDRESS tOHA DATA OUT tAA PREVIOUS DATA VALID DATA VALID C182–5 Read Cycle No. 2 [4, 10] tRC CE1 tACE1 tACE2 CE2 OE OE tHZOE tDOE DATA OUT tHZCE tLZOE HIGH IMPEDANCE HIGH IMPEDANCE DATA VALID tLZCE VCC SUPPLY CURRENT tPD tPU ICC 50% 50% ISB C182–6 [6] Write Cycle No. 1 (WE Controlled) tWC ADDRESS tSCE1 tSCE2 CS1 CS2 tAW WE tHA tSA tPWE tHD tSD DATA IN DATA VALID tHZWE DATA I/O tLZWE HIGH IMPEDANCE DATA UNDEFINED C182–7 Notes: 9. Device is continuously selected. OE, CE1 = VIL. CE2 = VIH. 10. If CE1 goes HIGH and CE2 goes LOW simultaneously with WE HIGH, the output remains in a high-impedance state. 4 CY7C182 Switching Waveforms (continued) Write Cycle No. 2 (CE Controlled) [6, 10] tWC ADDRESS CE1 tSCE1 tSA tSCE2 CE2 tAW tHA tPWE WE tSD DATA IN tHD DATA VALID tHZWE HIGH IMPEDANCE DATA I/O DATA UNDEFINED C182–8 Truth Table CE1 CE2 OE WE Data In Data Out H X X X Z Z Mode L H L H Z Valid Read L H X L Valid Z Write L H H H Z Z Output Disable X L X X Z Z Deselect Deselect/Power-Down Ordering Information Speed (ns) 25 35 45 Ordering Code Package Name Package Type CY7C182−25PC P21 28-Lead (300-Mil) Molded DIP CY7C182−25VC V21 28-Lead Molded SOJ CY7C182−35PC P21 28-Lead (300-Mil) Molded DIP CY7C182−35VC V21 28-Lead Molded SOJ CY7C182−45PC P21 28-Lead (300-Mil) Molded DIP CY7C182−45VC V21 28-Lead Molded SOJ Document #: 38-00110-F 5 Operating Range Commercial Commercial Commercial CY7C182 Package Diagrams 28-Lead (300-Mil) Molded DIP P21 51-85014-B 28-Lead (300-Mil) Molded SOJ V21 51-85031-B © Cypress Semiconductor Corporation, 1999. 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 Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor 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 Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.