AT27C516
Features
∙Fast Read Access Time - 45 ns
∙Low Power CMOS Operation
100 μA max. Standby
∙JEDEC Standard Packages 44-Lead PLCC
40-Lead TSOP (10mm x 14mm)
∙5V ± 10% Power Supply
∙High Reliability CMOS Technology 2000V ESD Protection
200 mA Latchup Immunity
∙Rapid™ Programming Algorithm - 50 μs/word (typical)
∙CMOS and TTL Compatible Inputs and Outputs
∙Integrated Product Identification Code
∙Commercial and Industrial Temperature Ranges30 mA max. Active at 5 MHz
Description
The AT27C516 is a low-power, high performance 524,288 bit one-time programmable read only memory (OTP EPROM) organized 32K by 16 bits. It requires only one 5V power supply in normal read mode operation. Any word can be accessed in less than 45 ns, eliminating the need for speed reducing WAIT states. The by-16 organization make this part ideal for high-performance 16 and 32 bit microprocessor sys-
tems.
(continued)
Pin Configurations
|
Pin Name |
Function |
||
|
A0 - A14 |
Addresses |
||
|
O0 - O15 |
Outputs |
||
|
|
|
|
|
|
CE |
Chip Enable |
||
|
|
|
|
|
|
|
|
|
|
|
OE |
Output Enable |
||
|
|
|
|
|
|
|
|
|
|
|
PGM |
Program Strobe |
||
|
NC |
No Connect |
||
|
|
|
|
|
Note: Both GND pins must be connected.
PLCC Top View
TSOP Top View
Type 1
Note: PLCC Package Pins 1 and 23 are DON’T CONNECT.
512K (32K x 16) OTP CMOS EPROM
0362C
3-145
Description (Continued)
In read mode, the AT27C516 typically consumes 15 mA. Standby mode supply current is typically less than 10 μA.
The AT27C516 is available in industry standard JEDEC-approved one-time programmable (OTP) plastic PLCC and TSOP packages. The device features two-line control (CE, OE) to eliminate bus contention in high-speed systems.
With 32K word storage capability, the AT27C516 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.
Atmel’s 27C516 have additional features to ensure high quality and efficient production use. The Rapid™ Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 50 μs/word. 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.
System 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 μF 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 μF 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.
3-146 |
AT27C516 |
|
|
AT27C516
Block Diagram |
Absolute Maximum Ratings* |
|
|
|
Temperature Under Bias |
................ -55°C to +125°C |
|
|
Storage Temperature...................... |
-65°C to +150°C |
|
|
Voltage on Any Pin with |
|
(1) |
|
Respect to Ground......................... |
-2.0V to +7.0V |
|
|
Voltage on A9 with |
|
(1) |
|
Respect to Ground ...................... |
- 2.0V to +14.0V |
|
|
VPP Supply Voltage with |
|
(1) |
|
Respect to Ground....................... |
- 2.0V to +14.0V |
*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.
Note: 1. Minimum voltage is -0.6V dc which may undershoot to - 2.0V for pulses of less than 20 ns. Maximum output
pin voltage is VCC + 0.75V dc which may overshoot to +7.0V for pulses of less than 20 ns.
Operating Modes
|
|
|
|
|
|
|
|
|
|
|
Mode \ Pin |
CE |
OE |
PGM |
Ai |
VPP |
Outputs |
||||
Read |
VIL |
VIL |
X (1) |
Ai |
X |
DOUT |
||||
Output Disable |
X |
VIH |
X |
X |
X |
High Z |
||||
Standby |
VIH |
X |
X |
X |
X (5) |
High Z |
||||
Rapid Program (2) |
VIL |
VIH |
VIL |
Ai |
VPP |
DIN |
||||
PGM Verify |
VIL |
VIL |
VIH |
Ai |
VPP |
DOUT |
||||
PGM Inhibit |
VIH |
X |
X |
X |
VPP |
High Z |
||||
Product Identification (4) |
VIL |
VIL |
X |
A9 = VH (3) |
VCC |
Identification |
||||
A0 = VIH or VIL |
||||||||||
Code |
||||||||||
|
|
|
|
|
|
|
A1 - A14 = VIL |
|
||
|
|
|
|
|
|
|
|
|
||
Notes: 1. X can be VIL or VIH. |
|
|
|
|
4. Two identifier words may be selected. All Ai inputs are held |
|||||
2. Refer to Programming characteristics. |
|
|
|
|
low (VIL), except A9 which is set to VH and A0 which is tog- |
|||||
3. VH = 12.0 ± 0.5V. |
|
|
|
|
|
|
gled low (VIL) to select the Manufacturer’s Identification |
|||
|
|
|
|
|
|
|
word and high (VIH) to select the Device Code word. |
5. Standby VCC current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in ISB.
3-147