1CY 7C23 5A CY7C235A 1K x 8 Registered PROM Features • Direct replacement for bipolar PROMs • Capable of withstanding greater than 2001V static discharge • CMOS for optimum speed/power • High speed Functional Description — 18 ns address set-up The CY7C235A is a high-performance 1024 word by 8 bit electrically programmable read only memory packaged in a slim 300-mil plastic or hermetic DIP, 28-pin leadless chip carrier, or 28-pin plastic leaded chip carrier. The memory cells utilize proven EPROM floating gate technology and byte-wide intelligent programming algorithms. — 12 ns clock to output • Low power — 495 mW (commercial) — 660 mW (military) • Synchronous and asynchronous output enables The CY7C235A replaces bipolar devices pin for pin and offers the advantages of lower power, superior performance, and high programming yield. The EPROM cell requires only 12.5V for the supervoltage, and low current requirements allow for gang programming. The EPROM cells allow for each memory location to be tested 100%, as each location is written into, erased, and repeatedly exercised prior to encapsulation. Each PROM is also tested for AC performance to guarantee that the product will meet AC specification limits after customer programming. • On-chip edge-triggered registers • Programmable asynchronous registers (INIT) • EPROM technology, 100% programmable • Slim, 300-mil, 24-pin plastic or hermetic DIP or 28-pin LCC and PLCC • 5V ±10% VCC, commercial and military • TTL-compatible I/O Logic Block Diagram Pin Configuration DIP Top View INIT O7 A9 O6 A8 ROW ADDRESS A7 PROGRAMMABLE ARRAY MULTIPLEXER O5 8-BIT EDGETRIGGERED REGISTER A6 A5 ADDRESS DECODER A4 O4 O3 A3 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC A8 A9 E INIT ES CP O7 O6 O5 O4 O3 C235A-2 A2 O2 COLUMN ADDRESS A1 LCC/PLCC Top View O1 A0 O0 CP CP ES C235A-1 E A4 A3 A2 A1 A0 NC O0 4 3 2 1 28 27 26 25 5 24 6 23 7 22 8 21 9 20 10 19 11 12 1314151617 18 E INIT ES CP NC O7 O6 C235A-3 Selection Guide 7C235A-18 18 12 90 Minimum Address Set-Up Time (ns) Maximum Clock to Output (ns) Maximum Operating Commercial Current (mA) Military Cypress Semiconductor Corporation • 3901 North First Street 7C235A-25 25 12 90 120 • 7C235A-30 30 15 90 120 7C235A-40 40 20 90 120 San Jose • CA 95134 • 408-943-2600 November 1992 – Revised March 1995 CY7C235A Maximum Ratings DC Program Voltage (Pins 7, 18, 20 for DIP) ............... 13.0V Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015) (Above which the useful life may be impaired. For user guidelines, not tested.) Latch-Up Current ..................................................... >200 mA Storage Temperature ..................................... −65°C to +150°C Operating Range Ambient Temperature with Power Applied.................................................. −55°C to +125°C Supply Voltage to Ground Potential (Pin 24 to Pin 12 for DIP) .................................. − 0.5V to +7.0V DC Voltage Applied to Outputs in High Z State .................................................... − 0.5V to +7.0V Range Ambient Temperature VCC Commercial 0°C to +70°C 5V ±10% −40°C to +85°C 5V ±10% − 55°C to +125°C 5V ±10% Industrial  Military DC Input Voltage .................................................−3.0V to +7.0V Electrical Characteristics Over Operating Range Parameter Description Test Conditions Min. VOH Output HIGH Voltage VCC = Min., IOH = −4.0 mA VIN = VIH or VIL VOL Output LOW Voltage VCC = Min., IOL = 16 mA VIN = VIH or VIL VIH Input HIGH Level Guaranteed Input Logical HIGH Voltage for All Inputs VIL Input LOW Level Guaranteed Input Logical LOW Voltage for All Inputs IIX Input Leakage Current GND < VIN < VCC VCD Input Clamp Diode Voltage Note 5 IOZ Output Leakage Current GND < VOUT < VCC Output Disabled IOS Output Short Circuit Current VCC = Max., VOUT = ICC Power Supply Current IOUT = 0 mA, VCC = Max. VPP Programming Supply Voltage IPP Programming Supply Current VIHP Input HIGH Programming Voltage VILP Input LOW Programming Voltage Max. Unit 2.4 V 0.4 V 2.0 V 0.8 V −10 +10 µA −10 +10 µA −20 −90 mA Commercial 90 mA Military 120 0.0V 12 13 V 50 mA 3.0 V 0.4 V Capacitance Parameter CIN COUT Description Input Capacitance Output Capacitance Test Conditions TA = 25°C, f = 1 MHz, VCC =5.0V Max. 10 10 Unit pF pF Notes: 1. 2. 3. 4. 5. 6. Contact a Cypress representative for industrial temperature range specifications. TA is the “instant on” case temperature. See the last page of this specification for Group A subgroup testing information. For devices using the synchronous enable, the device must be clocked after applying these voltages to perform this measurement. See Introduction to CMOS PROMs in this Data Book for general information on testing. For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds. a 2 CY7C235A AC Test Loads and Waveforms R1 250Ω 5V R1 250Ω 5V OUTPUT 50pF R2 167Ω (a) Normal Load Equivalent to: 5 pF INCLUDING JIGAND SCOPE INCLUDING JIGAND SCOPE ALL INPUT PULSES 3.0V OUTPUT R2 167Ω 90% 10% GND ≤ 5 ns C235A-4 90% 10% ≤ 5 ns C235A-5 (b) High Z Load THÉVENIN EQUIVALENT 100Ω OUTPUT 2.0V C235A-6 System timing is simplified in that the on-chip edge-triggered register allows the PROM clock to be derived directly from the system clock without introducing race conditions. The on-chip register timing requirements are similar to those of discrete registers available in the market. Operating Modes The CY7C235A incorporates a D-type, master-slave register on chip, reducing the cost and size of pipelined microprogrammed systems and applications where accessed PROM data is stored temporarily in a register. Additional flexibility is provided with synchronous (ES) and asynchronous (E) output enables and asynchronous initialization (INIT). The CY7C235A has an asynchronous initialize input (INIT). The initialize function is useful during power-up and time-out sequences and can facilitate implementation of other sophisticated functions such as a built-in “jump start” address. When activated the initialize control input causes the contents of a user programmed 1025th 8-bit word to be loaded into the on-chip register. Each bit is programmable and the initialize function can be used to load any desired combination of 1s and 0s into the register. In the unprogrammed state, activating INIT will generate a register CLEAR (all outputs LOW). If all the bits of the initialize word are programmed, activating INIT performs a register PRESET (all outputs HIGH). Upon power-up, the synchronous enable (ES) flip-flop will be in the set condition causing the outputs (O0 − O7) to be in the OFF or high-impedance state. Data is read by applying the memory location to the address input (A0 − A9) and a logic LOW to the enable (ES) input. The stored data is accessed and loaded into the master flip-flops of the data register during the address set-up time. At the next LOW-to-HIGH transition of the clock (CP), data is transferred to the slave flip-flops, which drive the output buffers, and the accessed data will appear at the outputs (O0 − O 7), provided the asynchronous enable (E) is also LOW. Applying a LOW to the INIT input causes an immediate load of the programmed initialize word into the master and slave flip-flops of the register, independent of all other inputs, including the clock (CP). The initialize data will appear at the device outputs after the outputs are enabled by bringing the asynchronous enable (E) LOW. The outputs may be disabled at any time by switching the asynchronous enable (E) to a logic HIGH, and may be returned to the active state by switching the enable to a logic LOW. Regardless of the condition of E, the outputs will go to the OFF or high-impedance state upon the next positive clock edge after the synchronous enable (ES) input is switched to a HIGH level. If the synchronous enable pin is switched to a logic LOW, the subsequent positive clock edge will return the output to the active state if E is LOW. Following a positive clock edge, the address and synchronous enable inputs are free to change since no change in the output will occur until the next LOW-to-HIGH transition of the clock. This unique feature allows the CY7C235A decoders and sense amplifiers to access the next location while previously addressed data remains stable on the outputs. When power is applied the (internal) synchronous enable flip-flop will be in a state such that the outputs will be in the high-impedance state. In order to enable the outputs, a clock must occur and the ES input pin must be LOW at least a set-up time prior to the clock LOW-to-HIGH transition. The E input may then be used to enable the outputs. When the asynchronous initialize input, INIT, is LOW, the data in the initialize byte will be asynchronously loaded into the output register. It will not, however, appear on the output pins until they are enabled, as described in the preceding paragraph. 3 CY7C235A Switching Characteristics Over Operating Range[3, 5] Parameter Description 7C235A-18 7C235A-25 7C235A-30 7C235A-40 Min. Min. Min. Min. Max. Max. 25 Max. 30 Max. tSA Address Set-Up to Clock HIGH 18 tHA Address Hold from Clock HIGH 0 tCO Clock HIGH to Valid Output tPWC Clock Pulse Width 12 12 15 20 ns tSES ES Set-Up to Clock HIGH 10 10 10 15 ns tHES ES Hold from Clock HIGH 5 tDI Delay from INIT to Valid Output tRI INIT Recovery to Clock HIGH 15 tPWI INIT Pulse Width 15 tCOS Inactive to Valid Output from Clock HIGH 0 0 12 12 5 25 20 ns 20 5 25 20 20 ns 0 15 5 20 HIGH 40 Unit ns 35 20 20 ns ns ns 25 ns 15 20 20 25 ns 15 20 20 25 ns tHZC Inactive Output from Clock tDOE Valid Output from E LOW 15 20 20 25 ns tHZE Inactive Output from E HIGH 15 20 20 25 ns Notes: 7. Applies only when the synchronous (ES) function is used. Switching Waveforms tHA tSA tHA tHES tSES tHES A0 − A10 ES tSES CP tPWC O0 − O7 tCO tHES tPWC tHZC tSES tPWC tPWC tPWC tCOS tPWC tCO tHZE tDOE E tDI tRI INIT C235A-7 tPWI Programming Information programming information, including a listing of software packages, please see the PROM Programming Information located at the end of this section. Programming algorithms can be obtained from any Cypress representative. Programming support is available from Cypress as well as from a number of third-party software vendors. For detailed 4 CY7C235A Table 1. Mode Selection. Pin Function Read or Output Disable A0, A3 − A9 A1 A2 CP ES E INIT O7 − O0 Other A0, A3 − A9 A1 A2 PGM VFY E VPP D7 − D0 Read A0, A3 − A9 A1 A2 X VIL VIL VIH O7 − O0 Output Disable A0, A3 − A9 A1 A2 X VIH X VIH High Z Output Disable A0, A3 − A9 A1 A2 X X VIH VIH High Z Initialize A0, A3 − A9 A1 A2 X X VIL VIL Init Byte Program A0, A3 − A9 A1 A2 VILP VIHP VIHP VPP D7 − D0 Program Verify A0, A3 − A9 A1 A2 VIHP VILP VIHP VPP O7 − O0 Program Inhibit A0, A3 − A9 A1 A2 VIHP VIHP VIHP VPP High Z Intelligent Program A0, A3 − A9 A1 A2 VILP VIHP VIHP VPP D7 − D0 Program Initialize Byte A0, A3 − A9 VPP VILP VILP VIHP VIHP VPP D7 − D0 Blank Check A0, A3 − A9 A1 A2 VIHP VILP VIHP VPP Zeros Mode Notes: 8. X = “don’t care” but not to exceed VCC ±5%. DIP Top View A7 A6 A5 A4 A3 A2 A1 A0 D0 D1 D2 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 LCC/PLCC Top View VCC A8 A9 E VPP VFY PGM D7 D6 D5 D4 D3 A4 A3 A2 A1 A0 NC D0 4 3 2 1 28 27 26 25 24 23 22 21 20 19 121314151617 18 5 6 7 8 9 10 11 E VPP VFY PGM NC D7 D6 C235A-9 C235A-8 Figure 1. Programming Pinouts. 5 CY7C235A Typical DC and AC Characteristics 1.6 CLOCK TO OUTPUT TIME vs. VCC NORMALIZED SUPPLY CURRENT vs. AMBIENT TEMPERATURE NORMALIZED SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.6 1.2 1.4 1.4 1.1 1.2 1.2 1.0 1.0 1.0 0.9 TA =25°C f = fMAX 0.8 0.6 4.0 4.5 5.0 5.5 0.8 TA =25°C 6.0 0.8 −55 25 125 0.6 4.0 AMBIENT TEMPERATURE (°C) SUPPLY VOLTAGE (V) CLOCK TO OUTPUT TIME vs. TEMPERATURE 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V) NORMALIZED SET-UP TIME vs. SUPPLY VOLTAGE NORMALIZED SET-UP TIME vs. TEMPERATURE 1.6 1.2 1.6 1.4 1.0 1.4 1.2 1.2 0.8 1.0 1.0 0.6 0.8 0.8 TA =25°C 0.6 −55 25 125 0.4 4.0 AMBIENT TEMPERATURE (°C) 5.0 5.5 6.0 VCC =5.5V TA =25°C 0.98 125 25 AMBIENT TEMPERATURE (°C) TYPICAL ACCESS TIME CHANGE vs. OUTPUT LOADING OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 175 30.0 1.00 0.6 −55 SUPPLY VOLTAGE (V) NORMALIZED SUPPLY CURRENT vs. CLOCK PERIOD 1.02 4.5 150 25.0 125 20.0 100 0.96 15.0 0.94 10.0 0.92 0 25 50 75 CLOCK PERIOD (ns) 100 0.0 VCC =5.0V TA =25°C 50 TA =25°C VCC =4.5V 5.0 0.90 0.88 75 0 200 400 600 800 1000 CAPACITANCE (pF) 25 0 0.0 1.0 2.0 3.0 4.0 OUTPUT VOLTAGE (V) C235A-10 6 CY7C235A Ordering Information Speed (ns) tSA tCO Ordering Code 18 12 CY7C235A-18DC CY7C235A-18JC CY7C235A-18PC 25 12 CY7C235A-25DC CY7C235A-25JC CY7C235A-25PC CY7C235A-25DMB CY7C235A-25LMB 30 15 CY7C235A-30DC CY7C235A-30JC CY7C235A-30PC CY7C235A-30DMB CY7C235A-30LMB 40 20 CY7C235A-40DC CY7C235A-40JC CY7C235A-40PC CY7C235A-40DMB CY7C235A-40LMB Package Name D14 J64 P13 D14 J64 P13 D14 L64 D14 J64 P13 D14 L64 D14 J64 P13 D14 L64 Package Type 24-Lead (300-Mil) CerDIP 28-Lead Plastic Leaded Chip Carrier 24-Lead (300-Mil) Molded DIP 24-Lead (300-Mil) CerDIP 28-Lead Plastic Leaded Chip Carrier 24-Lead (300-Mil) Molded DIP 24-Lead (300-Mil) CerDIP 28-Square Leadless Chip Carrier 24-Lead (300-Mil) CerDIP 28-Lead Plastic Leaded Chip Carrier 24-Lead (300-Mil) Molded DIP 24-Lead (300-Mil) CerDIP 28-Square Leadless Chip Carrier 24-Lead (300-Mil) CerDIP 28-Lead Plastic Leaded Chip Carrier 24-Lead (300-Mil) Molded DIP 24-Lead (300-Mil) CerDIP 28-Square Leadless Chip Carrier Operating Range Commercial Commercial Military Commercial Military Commercial Military Notes: 9. Most of the above products are available in industrial temperature range. Contact a Cypress representative for specifications and product availability. MILITARY SPECIFICATIONS Group A Subgroup Testing Switching Characteristics Parameter tSA tHA tCO DC Characteristics Parameter VOH VOL VIH VIL IIX IOZ ICC Subgroups 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 Subgroups 7, 8, 9, 10, 11 7, 8, 9, 10, 11 7, 8, 9, 10, 11 Document #: 38-00229-C 7 CY7C235A Package Diagrams 24-Lead (300-Mil) CerDIP D14 MIL-STD-1835 28-Lead Plastic Leaded Chip Carrier J64 D-9 Config.A 28-Square Leadless Chip Carrier L64 MIL-STD-1835 C-4 8 CY7C235A Package Diagrams (Continued) 24-Lead (300-Mil) Molded DIP P13/P13A © Cypress Semiconductor Corporation, 1996. 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.