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AT27C040
Features
* Fast Read Access Time - 70 ns * Low Power CMOS Operation *
100 A max. Standby 30 mA max. Active at 5 MHz JEDEC Standard Packages 32-Lead 600-mil PDIP 32-Lead 450-mil SOIC (SOP) 32-Lead PLCC 32-Lead TSOP 5V 10% Supply High Reliability CMOS Technology 2000V ESD Protection 200 mA Latchup Immunity RapidTMProgramming Algorithm - 100 s/byte (typical) CMOS and TTL Compatible Inputs and Outputs Integrated Product Identification Code Commercial and Industrial Temperature Ranges
* * * * * *
4-Megabit (512K x 8) OTP EPROM AT27C040
Description
The AT27C040 chip is a low-power, high-performance, 4,194,304-bit one-time programmable read only memory (OTP EPROM) organized as 512K by 8 bits. The AT27C040 requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 70 ns, eliminating the need for speed reducing WAIT states on high-performance microprocessor systems. Atmel's scaled CMOS technology provides low active power consumption, and fast programming. Power consumption is typically 8 mA in active mode and less than 10 A in standby mode. (continued)
Pin Configurations
Pin Name A0 - A18 O0 - O7 CE OE Function Addresses Outputs Chip Enable Output Enable
PDIP, SOIC Top View
PLCC Top View TSOP Top View
0189E-A-7/97
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The AT27C040 is available in a choice of industry standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, SOIC (SOP), and TSOP packages. The device features two-line control (CE, OE) to eliminate bus contention in high-speed systems. Atmel's AT27C040 has additional features to ensure high quality and efficient production use. The RapidTMProgramming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 s/byte. The Integrated Product Identification Code electronically identifies the device and manufacturer. This feature is used by industry standard programming equipment to select the proper programming algorithms and voltages.
Switching Considerations
Switching between active and standby conditions via the Chip Enable pin may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device non-conformance. At a minimum, a 0.1 F high frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the VCC and Ground terminals of the device, as close to the device as possible. Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7 F bulk electrolytic capacitor should be utilized, again connected between the VCC and Ground terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array.
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AT27C040
AT27C040
Block Diagram
Operating Modes
Mode/Pin Read Output Disable Standby Rapid Program(2) CE VIL X VIH VIL X VIH
(4)
OE VIL VIH X VIH VIL VIH VIL
Ai Ai X X Ai Ai X A9 = VH(3) A0 = VIH or VIL A1 - A18 = VIL
VPP X(1) X X VPP VPP VPP X
Outputs DOUT High Z High Z DIN DOUT High Z Identification Code
PGM Verify PGM Inhibit Product Identification
Notes:
VIL
1. X can be VIL or VIH. 2. Refer to Programming Characteristics 3. VH = 12.0 0.5V. 4. Two identifier bytes may be selected. All Ai inputs are held low (VIL), except A9 which is set to VH and A0 which is toggled low (VIL) to select the Manufacturer's Identificaton byte and high (VIH) to select the Device Code byte.
Absolute Maximum Ratings*
Temperature Under Bias ......................-55C to +125C Storage Temperature............................-65C to +150C Voltage on Any Pin with Respect to Ground ..............................-2.0V to +7.0V (1) Voltage on A9 with Respect to Ground ...........................-2.0V to +14.0V (1) VPP Supply Voltage with Respect to Ground ............................-2.0V to +14.0V (1)
*NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
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DC and AC Operating Conditions for Read Operation
AT27C040 -70 Operating Temperature (Case) VCC Power Supply Com. Ind. 0C - 70C -40C - 85C 5V 10% -90 0C - 70C -40C - 85C 5V 10% -12 0C - 70C -40C - 85C 5V 10% -15 0C - 70C -40C - 85C 5V 10%
DC and Operating Characteristics for Read Operation
Symbol ILI ILO IPP1 ISB ICC VIL VIH VOL VOH
Notes:
(2)
Paramter Input Load Current Output Leakage Current VPP(1) Read/Standby Current
Condition VIN = 0V to VCC VOUT = 0V to VCC VPP = VCC ISB1 (CMOS), CE = VCC 0.3V ISB2 (TTL), CE = 2.0 to VCC + 0.5V f = 5 MHz, IOUT = 0 mA, CE = VIL
Min
Max 1 5 10 100 1 30
Units A A A A mA mA V V V V
VCC1(1) Standby Current VCC Active Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage
-0.6 2.0 IOL = 2.1 mA IOH = -400 A 2.4
0.8 VCC + 0.5 0.4
1. VCC must be applied simultaneously or before VPP, and removed simultaneously or after VPP. 2. VPP may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and IPP.
AC Characteristics for Read Operation
AT27C040 -70 Symbol tACC(3) tCE(2) tOE(2)(3) tDF(4)(5) Parameter Address to Output Delay CE to Output Delay OE to Output Delay OE or CE High to Output Float, whichever occurred first Output Hold from Address, CE or OE, whichever occurred first
2, 3, 4, 5 - see AC Waveforms for Read Operation
-90 Min Max 90 90 35 20 Min
-12 Max 120 120 35 30 Min
-15 Max 150 150 40 30 Units ns ns ns ns
Condition CE = OE = VIL OE = VIL CE = VIL
Min
Max 70 70 30 20
tOH
Note:
0
0
0
0
ns
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AT27C040
AT27C040
AC Waveforms for Read Operation(1)
Notes:
1. 2. 3. 4. 5.
Tiiming measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE. OE may be delayed up to tACC - tOE after the address is valid without impact on tACC. This parameter is only sampled and is not 100% tested. Output float is defined as the point when data is no longer driven.
Input Test Waveforms and Measurement Levels
Output Test Load
Pin Capacitance
(f = 1 MHz, T = 25C) (1) Typ
CIN COUT Note: 4 8
Max
8 12
Units
pF pF
Conditions
VIN = 0V VOUT = 0V
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
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Programming Waveforms(1)
Notes:
1. 2. 3.
The Input Timing Reference is 0.8V for V IL and 2.0V for VIH. tOE and tDFP are characteristics of the device but must be accommodated by the programmer. When programming the AT27C040 a 0.1 F capacitor is required across VPP and ground to supress spurious voltage transients.
DC Programming Characteristics
TA = 25 5C, VCC = 6.5 0.25V, VPP = 13.0 0.25V Limits Symbol
ILI VIL VIH VOL VOH ICC2 IPP2 VID
Parameter
Input Load Current Input Low Level Input High Level Output Low Voltage Output High Voltage VCC Supply Current (Program and Verify) VPP Supply Current A9 Product Identification Voltage
Test Conditions
VIN = VIL, VIH
Min
Max
10
Units
A V V V V
-0.6 2.0 IOL = 2.1 mA IOH = -400 A 2.4
0.8 VCC + 0.7 0.4
40 CE = VIL 11.5 20 12.5
mA mA V
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AT27C040
AT27C040
AC Programming Characteristics
TA = 25 5C, VCC = 6.5 0.25V, VPP = 13.0 0.25V Limits Symbol tAS tOES tDS tAH tDH tDFP tVPS tVCS tPW tOE tPRT
Notes:
Parameter Address Setup Time OE Setup Time Data Setup Time Address Hold Time Data Hold Time OE High to Output Float Delay(2) VPP Setup Time VCC Setup Time CE Program Pulse Width Data Valid from OE(2) VPP Pulse Rise Time During Programming
(3)
Test Conditions(1)
Min 2
Max
Units s s s s s
Input Rise and Fall Times (10% to 90%) 20ns Input Pulse Levels 0.45V to 2.4V Input Timing Reference Level 0.8V to 2.0V Output Timing Reference Level 0.8V to 2.0V
2 2 0 2 0 2 2 95 105 150 50 130
ns s s s ns ns
1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP. 2. This parameter is only sampled and is not 100% tested. Output Float is defined as the point where data is no longer driven -- see timing diagram. 3. Program Pulse width tolerance is 100 sec 5%.
Atmel's 27C040 Integrated Product Identification Code
Pins Codes Manufacturer Device Type A0 0 1 O7 0 0 O6 0 0 O5 0 0 O4 1 0 O3 1 1 O2 1 0 O1 1 1 O0 0 1 Hex Data 1E 0B
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Rapid Programming Algorithm
A 100 s CE pulse width is used to program. The address is set to the first location. VCC is raised to 6.5V and VPP is raised to 13.0V. Each address is first programmed with one 100 s CE pulse without verification. Then a verification/reprogramming loop is executed for each address. In the event a byte fails to pass verification, up to 10 successive 100 s pulses are applied with a verification after each pulse. If the byte fails to verify after 10 pulses have been applied, the part is considered failed. After the byte verifies properly, the next address is selected until all have been checked. VPP is then lowered to 5.0V and VCC to 5.0V. All bytes are read again and compared with the original data to determine if the device passes or fails.
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AT27C040
AT27C040
Ordering Information
ICC (mA) tACC (ns) 70 Active 30 Standby 0.1 Ordering Code AT27C040-70JC AT27C040-70PC AT27C040-70RC AT27C040-70TC 30 0.1 AT27C040-70JI AT27C040-70PI AT27C040-70RI AT27C040-70TI 90 30 0.1 AT27C040-90JC AT27C040-90PC AT27C040-90RC AT27C040-90TC 30 0.1 AT27C040-90JI AT27C040-90PI AT27C040-90RI AT27C040-90TI 120 30 0.1 AT27C040-12JC AT27C040-12PC AT27C040-12RC AT27C040-12TC 30 0.1 AT27C040-12JI AT27C040-12PI AT27C040-12RI AT27C040-12TI 150 30 0.1 AT27C040-15JC AT27C040-15PC AT27C040-15RC AT27C040-15TC 30 0.1 AT27C040-15JI AT27C040-15PI AT27C040-15RI AT27C040-15TI Package 32J 32P6 32R 32T 32J 32P6 32R 32T 32J 32P6 32R 32T 32J 32P6 32R 32T 32J 32P6 32R 32T 32J 32P6 32R 32T 32J 32P6 32R 32T 32J 32P6 32R 32T Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Operation Range Commercial (0C to 70C)
Package Type
32J 32P6 32R 32T 32-Lead, Plastic J-Leaded Chip Carrier (PLCC) 32-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 32-Lead, 0.450" Wide, Plastic Gull Wing Small Outline (SOIC) 32-Lead, Plastic Thin Small Outline Package (TSOP)
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