ATF16V8BQ ATMEL Corporation, ATF16V8BQ Datasheet - Page 5

• Manufacturer Part Number: ATF16V8BQ
• Description: High- Performance Flash PLD
• Manufacturer: ATMEL Corporation

Input Test Waveforms and
Measurement Levels:
t
Pin Capacitance
f = 1 MHz, T = 25°C
Note:
Power Up Reset
The registers in the ATF16V8Bs are designed to reset dur-
ing power up. At a point delayed slightly from V
V
the registered output state will always be high on power-up.
This feature is critical for state machine initialization. How-
ever, due to the asynchronous nature of reset and the
uncertainty of how V
lowing conditions are required:
1) The V
2) After reset occurs, all input and feedback setup times
3) The clock must remain stable during t
Preload of Registered Outputs
The ATF16V8B’s registers are provided with circuitry to
allow loading of each register with either a high or a low.
This feature will simplify testing since any state can be
forced into the registers to control test sequencing. A
JEDEC file with preload is generated when a source file
with vectors is compiled. Once downloaded, the JEDEC file
preload sequence will be done automatically by most of the
approved programmers after the programming.
R
C
C
RST
, t
IN
OUT
must be met before driving the clock pin high, and
F
, all registers will be reset to the low state. As a result,
< 5 ns (10% to 90%)
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
CC
rise must be monotonic,
(1)
CC
actually rises in the system, the fol-
Typ
5
6
PR
.
CC
Max
8
8
crossing
Output Test Loads:
Commercial
Security Fuse Usage
A single fuse is provided to prevent unauthorized copying
of the ATF16V8B fuse patterns. Once programmed, fuse
verify and preload are inhibited. However, the 64-bit User
Signature remains accessible.
The security fuse should be programmed last, as its effect
is immediate.
Parameter
t
V
PR
RST
Units
pF
pF
Power-Up
Reset Time
Power-Up
Reset Voltage
Description
Conditions
V
V
OUT
IN
= 0 V
= 0 V
Typ
600
3.8
1,000
Max
4.5
Units
ns
V
5