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1CY 7C25 4
CY7C251 CY7C254
16K x 8 Power Switched and Reprogrammable PROM
Features
* CMOS for optimum speed/power * Windowed for reprogrammability * High speed -- 45 ns * Low power -- 550 mW (commercial) -- 660 mW (military) * Super low standby power (7C251) -- Less than 165 mW when deselected * * * * * * -- Fast access: 50 ns EPROM technology 100% programmable Slim 300-mil or standard 600-mil packaging available 5V 10% VCC, commercial and military TTL-compatible I/O Direct replacement for bipolar PROMs Capable of withstanding >2001V static discharge
Functional Description
The CY7C251 and CY7C254 are high-performance 16,384-word by 8-bit CMOS PROMs. When deselected, the CY7C251 automatically powers down into a low-power stand-by mode. It is packaged in a 300-mil-wide package. The 7C254 is packaged in a 600-mil-wide package and does not power down when deselected. The 7C251 and 7C254 are available in reprogrammable packages equipped with an erasure window; when exposed to UV light, these PROMs are erased and can then be reprogrammed. The memory cells utilize proven EPROM floating gate technology and byte-wide intelligent programming algorithms. The CY7C251 and CY7C254 are plug-in replacements for bipolar devices and offer the advantages of lower power, superior performance, and high programming yield. The EPROM cell requires only 12.5V for the super voltage, and low current requirements allow for gang programming. The EPROM cells allow each memory location to be tested 100% because each location is written into, erased, and repeatedly exercised prior to encapsulation. Each PROM is also tested for AC performance to guarantee that after customer programming, the product will meet DC and AC specification limits. Reading is accomplished by placing all four chip selects in their active states. The contents of the memory location addressed by the address lines (A0 - A13) will become available on the output lines (O0 - O7).
Logic Block Diagram
A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 POWER-DOWN (7C251) COLUMN ADDRESS Y ADDRESS DECODER ROW ADDRESS X 512 x 256 PROGRAMABLE ARRAY 8 x 1 OF 32 MULTIPLEXER
Pin Configurations
O7 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 GND
DIP/Flatpack
1 2 3 4 5 6 7C251 7 8 9 7C254 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC A10 A11 A12 A13 CS1 CS2 CS3 CS4 O7 O6 O5 O4 O3
O6
O5
O4
O3
C251-2
LCC
O2 A5 A4 A3 A2 A1 A0 NC O0 O1 4 3 2 1 32 31 30 29 5 28 6 7C251 27 7 26 8 25 9 24 10 7C254 23 11 22 12 21 13 14151617 181920 A12 A13 CS1 CS2 CS3 CS4 NC O7 O6
O1
O0 CS1 CS2 CS3 CS4 C251-1
C251-3
Cypress Semiconductor Corporation
*
3901 North First Street
*
San Jose * CA 95134 * 408-943-2600 November 1986 - Revised December 1992
CY7C251 CY7C254
Selection Guide
7C251-45, 7C254-45 Maximum Access Time (ns) Maximum Operating Current (mA) Standby Current (mA) (7C251 only) Commercial Military Commercial Military 45 100 120 30 35 7C251-55, 7C254-55 55 100 120 30 35 7C251-65, 7C254-65 65 100 120 30 35
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................. -65C to +150C Ambient Temperature with Power Applied............................................. -55C to +125C Supply Voltage to Ground Potential (Pin 28 to Pin 14) ........................................... -0.5V to +7.0V DC Voltage Applied to Outputs in High Z State ............................................... -0.5V to +7.0V DC Input Voltage............................................ -3.0V to +7.0V DC Program Voltage (Pin 22) .......................................13.5V
Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015) Latch-Up Current .................................................... >200 mA UV Exposure ................................................ 7258 Wsec/cm 2
Operating Range
Range Commercial Industrial[1] Military[2]
]
Ambient Temperature 0C to +70C -40C to +85C -55C to +125C
VCC 5V 10% 5V 10% 5V 10%
Electrical Characteristics Over the Operating Range[3, 4]
7C251-45,55,65 7C254-45,55,65 Parameter VOH VOL VIH VIL IIX VCD IOZ IOS ICC ISB VPP IPP VIHP VILP Description Output HIGH Voltage Output LOW Voltage Input HIGH Level Input LOW Level Input Current Input Diode Clamp Voltage Output Leakage Current Output Short Circuit Current[5] Power Supply Current Standby Supply Current (7C251) Programming Supply Voltage Programming Supply Current Input HIGH Programming Voltage Input LOW Programming Voltage 3.0 0.4 GND < VOUT < VCC, Output Disabled VCC = Max., VOUT = GND VCC = Max., IOUT = 0 mA VCC = Max., IOUT = 0 mA VCC = Max., CS1 = VIH, IOUT = 0 mA Com'l Mil Com'l Mil 12 -40 -20 Test Conditions VCC = Min., IOH = -4.0 mA VCC = Min., IOL = 16.0 mA Guaranteed Input Logical HIGH Voltage for All Inputs Guaranteed Input Logical LOW Voltage for All Inputs GND < VIN < VCC -10 Note 4 +40 -90 100 120 30 35 13 50 V mA V V mA A mA mA Min. 2.4 0.5 2.0 0.8 +10 Max. Unit V V V V A
Notes: 1. Contact a Cypress representative regarding industrial temperature range specification. 2. TA is the "instant on" case temperature. 3. See the last page of this specification for Group A subgroup testing information. 4. See the "Introduction to CMOS PROMs" section of the Cypress Data Book for general information on testing. 5. For test purposes, not more than one output at a time should be shorted. Short circuit test duration should not exceed 30 seconds.
2
CY7C251 CY7C254
Capacitance[4]
Parameter CIN COUT Description Input Capacitance Output Capacitance Test Conditions TA = 25C, f = 1 MHz, VCC = 5.0V Max. 10 10 Unit pF pF
AC Test Loads and Waveforms[4]
5V OUTPUT 30 pF INCLUDING JIG AND SCOPE R2 159 R1 235 5V OUTPUT 5 pF INCLUDING JIG AND SCOPE R2 159 R1 235 3.0V GND
C251-4
ALL INPUT PULSES 90% 90% 10% 10% 5 ns
5
ns
C251-5
(a) Normal Load
Equivalent to: THEVENINEQUIVALENT OUTPUT 95
(b) High Z Load
2.02V
C251-6
Switching Characteristics Over the Operating Range[2, 4]
7C251-45 7C254-45 Parameter tAA tHZCS1 tHZCS2 tACS1 tACS2 tPU tPD Description Address to Output Valid Chip Select Inactive to High Z[6] Chip Select Inactive to High Z (7C251, CS1 Only) Chip Select Active to Output Valid[6] Chip Select Active to Output Valid (7C251, CS1 Only) Chip Select Active to Power Up (7C251) Chip Select Inactive to Power Down (7C251) [7] 0 50 Min. Max. 45 25 50 25 50 0 60 7C251-55 7C254-55 Min. Max. 55 30 60 30 60 0 70 7C251-65 7C254-65 Min. Max. 65 35 70 35 70 Unit ns ns ns ns ns ns ns
Switching Waveform[4, 7]
tPD VCC SUPPLY CURRENT A0 - A13 ADDRESS 50% tPU 50%
CS3 CS1, CS2, CS4 tAA O0 - O7
C251-7
tHZCS
tACS
Notes: 6. tHZCS1 and tACS1 refers to 7C254 (all chip selects); and 7C251 (CS2, CS3 and CS4 only). 7. Power-down controlled by 7C251 CS1 only.
3
CY7C251 CY7C254
Erasure Characteristics
Wavelengths of light less than 4000 angstroms begin to erase the 7C251 and 7C254 in the windowed package. For this reason, an opaque label should be placed over the window if the PROM is exposed to sunlight or fluorescent lighting for extended periods of time. The recommended dose of ultraviolet light for erasure is a wavelength of 2537 angstroms for a minimum dose (UV intensity x exposure time) of 25 Wsec/cm2. For an ultraviolet lamp with a 12 mW/cm2 power rating, the exposure time would be approximately 35 minutes. The 7C251 or 7C254 needs to be within 1 inch of the lamp during erasure. Permanent damage may result if the PROM is exposed to high-intensity UV light for an extended period of time. 7258 Wsec/cm2 is the recommended maximum dosage.
Blankcheck
Blankcheck is accomplished by performing a verify cycle (VFY toggles on each address), sequencing through all memory address locations, where all the data read will be zeros.
Programming Information
Programming support is available from Cypress as well as from a number of third-party software vendors. For detailed 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.
Table 1. Mode Selection Pin Function[8] Read or Output Disable Mode Read Output Disable Output Disable Output Disable Output Disable Program Program Verify Program Inhibit Blank Check
Note: 8. X = "don't care" but not to exceed VCC 5%.
A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0 A13 - A0
CS4 NA VIL X X X VIH X X X X
CS3 VFY VIH X X VIL X VIHP VILP VIHP VILP
CS2 VPP VIL X VIH X X VPP VPP VPP VPP
CS1 PGM VIL VIH X X X VILP VIHP VIHP VIHP
O 7 - O0 D 7 - D0 O7 -O0 High Z High Z High Z High Z D 7 - D0 O 7 - O0 High Z O 7 - O0
Other
DIP/Flatpack Top View
A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 D0 D1 D2 GND 1 2 3 4 5 6 7C251 7 8 9 7C254 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC A10 A11 A12 A13 PGM VPP VFY NA D7 D6 D5 D4 D3 C251-8
LCC Top View
A5 A4 A3 A2 A1 A0 NC D0 D1
4 3 2 1 32 31 30 29 5 28 6 7C251 27 7 26 8 25 9 24 10 23 11 7C254 22 12 21 13 14 15 16 17 18 19 20
A12 A13 PGM VPP VFY NA NC D7 D6
C251-9
Figure 1. Programmable Pinout
4
CY7C251 CY7C254
Typical DC and AC Characteristics
NORMALIZED SUPPLYCURRENT vs. SUPPLY VOLTAGE 1.6 1.4 1.1 1.2 1.0 1.0 0.8 0.6 4.0 TA =25C f = fMAX 4.5 5.0 5.5 6.0 0.9 0.6 TA =25C 0.8 -55 25 125 0.4 4.0 4.5 5.0 5.5 6.0 0.8 1.0 1.2 NORMALIZED SUPPLYCURRENT vs. AMBIENT TEMPERATURE 1.2 NORMALIZED ACCESS TIME vs. SUPPLY VOLTAGE
SUPPLYVOLTAGE (V)
AMBIENT TEMPERATURE (C)
SUPPLY VOLTAGE (V)
NORMALIZED ACCESS TIME vs. TEMPERATURE 1.6 1.4 40 1.2 30 1.0 0.8 0.6 - 55 20 10 0 25 125 AMBIENT TEMPERATURE (C) 60 50
OUTPUT SOURCE CURRENT vs. VOLTAGE 30.0 25.0 20.0 15.0 10.0 5.0 0 1.0 2.0 3.0 4.0 0.0
TYPICAL ACCESS TIME CHANGE vs. OUTPUT LOADING
VCC =4.5V TA =25C 0 200 400 600 800 1000
OUTPUTVOLTAGE (V)
CAPACITANCE (pF)
OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 175 150 125 100 75 50 25 0 0.0 1.0 2.0 3.0 4.0 VCC =5.0V TA =25C
OUTPUT VOLTAGE (V)
5
CY7C251 CY7C254
Ordering Information[9]
Speed (ns) 45 Ordering Code CY7C251-45PC CY7C251-45WC CY7C251-45DMB CY7C251-45WMB 55 CY7C251-55PC CY7C251-55WC CY7C251-55DMB CY7C251-55LMB CY7C251-55QMB CY7C251-55WMB 65 CY7C251-65PC CY7C251-65WC CY7C251-65DMB CY7C251-65LMB CY7C251-65QMB CY7C251-65WMB Speed (ns) 45 Package Name P21 W22 D22 W22 P21 W22 D22 L55 Q55 W22 P21 W22 D22 L55 Q55 W22 Package Name P15 W16 D16 W16 P15 W16 D16 Q55 W16 P15 W16 D16 Q55 W16 Package Type 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) CerDIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) CerDIP 32-Pin Rectangular Leadless Chip Carrier 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) Molded DIP 28-Lead (300-Mil) Windowed CerDIP 28-Lead (300-Mil) CerDIP 32-Pin Rectangular Leadless Chip Carrier 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead (300-Mil) Windowed CerDIP Operating Range Commercial Military Commercial Military Military Commercial Military Commercial Military Operating Range Commercial
Ordering Code CY7C254-45PC CY7C254-45WC CY7C254-45DMB CY7C254-45WMB
Package Type 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 28-Lead (600-Mil) CerDIP 28-Lead (600-Mil) Windowed CerDIP 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 28-Lead (600-Mil) CerDIP 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead (600-Mil) Windowed CerDIP 28-Lead (600-Mil) Molded DIP 28-Lead (600-Mil) Windowed CerDIP 28-Lead (600-Mil) CerDIP 32-Pin Windowed Rectangular Leadless Chip Carrier 28-Lead (600-Mil) Windowed CerDIP
55
CY7C254-55PC CY7C254-55WC CY7C254-55DMB CY7C254-55QMB CY7C254-55WMB
65
CY7C254-65PC CY7C254-65WC CY7C254-65DMB CY7C254-65QMB CY7C254-65WMB
Commercial Military
Note: 9. Most of these products are available in industrial temperature range. Contact a Cypress representative for specifications and product availability.
6
CY7C251 CY7C254
MILITARY SPECIFICATIONS Group A Subgroup Testing DC Characteristics
Parameter VOH VOL VIH VIL IIX IOZ ICC ISB[10] Subgroups 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3
SMD Cross Reference
SMD Number 5962-8953701 5962-8953701 5962-8953701 5962-8953702 5962-8953702 5962-8953702 5962-8953801 5962-8953801 5962-8953801 5962-8953802 Suffix YX ZX VX YX ZX VX XX ZX VX XX ZX VX Cypress Number CY7C251-65WMB CY7C251-65TMB CY7C251-65QMB CY7C251-55WMB CY7C251-55TMB CY7C251-55QMB CY7C254-65WMB CY7C254-65TMB CY7C254-65QMB CY7C254-55WMB CY7C254-55TMB CY7C254-55QMB
Switching Characteristics
Parameter tAA tACS1[11] tACS2[10] Subgroups 7, 8, 9, 10, 11 7, 8, 9, 10, 11 7, 8, 9, 10, 11
5962-8953802 5962-8953802
Notes: 10. 7C251 (CS 1 only). 11. 7C254 and 7C251 (CS2, CS 3 and CS4 only).
Document #: 38-00056-G
7
CY7C251 CY7C254
Package Diagrams
28-Lead (300-Mil) CerDIP D22 28-Lead (600-Mil) CerDIP D16
MIL-STD-1835 D-10 Config.A MIL-STD-1835 D- Config. A 15
32-Pin Rectangular Leadless Chip Carrier L55
MIL-STD-1835 C-12
32-Pin Windowed Rectangular Leadless Chip Carrier Q55
MIL-STD-1835 C-12
8
CY7C251 CY7C254
Package Diagrams (continued)
28-Lead (600-Mil) Molded DIP P15
28-Lead (300-Mil) Molded DIP P21
9
CY7C251 CY7C254
Package Diagrams (continued)
28-Lead (600-Mil) Windowed CerDIP W16
MIL-STD-1835 D-10 Config. A
28-Lead (300-Mil) Windowed CerDIP W22
MIL-STD-1835 D-15 Config. A
(c) Cypress Semiconductor Corporation, 1992. 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.

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