The ATF16V8C is a high performance EECMOS Programmable Logic Device that utilizes Atmel’s proven electrically erasable Flash memory technology. S peeds down
to 5 ns and a 100 µA pin-controlled power down mode option are offered. All speed ranges are specified over the
full 5V ± 10% range for industrial temperature ranges; 5V
± 5% for commercial range 5-volt devices.
The ATF16V8C incorporates a superset of the generic architectures, which allows direct replacement of the 16R8
family and most 20-pin combinatorial PLDs. Eight outputs
are each allocated eight product terms. Three different
Absolute Maximum Ratings*
Temperature Under Bias...................-40°C to +85°C
Storage Temperature......................-65°C to +150°C
Voltage on Any Pin with
Respect to Ground.........................-2.0V to +7.0V
Voltage on Input Pins
with Respect to Ground
During Programming....................-2.0V to +14.0V
Programming Voltage with
Respect to Ground.......................-2.0V to +14.0V
(1)
(1)
(1)
modes of operation, configured automatically with software, allow highly complex logic functions to be realized.
The ATF16V8C can significantly reduce total system
power, thereby enhancing system reliability and reducing
power supply costs. When pin 4 is configured as the
power down control pin , supply current drops to less than
100 µA whenever the pin is high. If the power down feature isn’t required for a particular application, pin 4 may be
used as a logic input. Also, the pin keeper circuits eliminate the need for internal pull-up resistors along with their
attendant power consumption.
*NOTICE: Stresses beyond those listed under “Absolute Maxi-
mum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the
device at these or an y ot he r con ditions beyond those indicated in the oper ational 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 + 0.75 V dc, whic h may overshoot to 7. 0V
for pulses of le ss than 20 ns.
DC and AC Operating Conditions
CommercialIndustrial
Operating Temperature (Case)0°C - 70°C-40°C - 85°C
V
Power Supply5V ± 5%5V ± 10%
CC
2
ATF16V8C
ATF16V8C
DC Characteristics
Symbol ParameterConditionMinTypMaxUnits
I
IL
I
IH
I
CC1
I
PD
I
OS
V
IL
V
IH
V
OL
V
OH
I
OL
I
OH
Note: 1. All ICC parameters measure d wit h outputs open.
Note:1. Timing measuremen t reference is 1.5V. In pu t AC driv in g le ve ls ar e 0. 0V an d 3.0V, unless otherw is e sp ec ified.
(1)
3
AC Characteristics
Symbol Parameter
t
PD
t
CF
t
CO
t
S
t
H
t
P
t
W
F
t
EA
t
ER
t
PZX
t
PXZ
Input or Feedback to Non-Registered
Output
Clock to Feedback33ns
Clock to Output1425ns
Input or Feedback Setup Time35ns
Input Hold Time00ns
Clock Period68ns
Clock Width34ns
External Feedback 1/(tS+ tCO)142100MHz
MAX
Internal Feedback 1/(t
No Feedback 1/(t
Input to Output Enable —
Product Term
Input to Output Disable —
Product Term
OE pin to Output Enable2526ns
OE pin to Output Disable1.551.56ns
-5-7
MinMaxMinMax
Units
1537.5ns
+ tCF)166125MHz
S
)166125MHz
P
2639ns
2529ns
Power Down AC Characteristics
Symbol Parameter
t
IVDH
t
GVDH
t
CVDH
t
DHIX
t
DHGX
t
DHCX
t
DLIV
t
DLGV
t
DLCV
t
DLOV
Notes: 1. Output data is latched an d he ld .
Valid Input Before PD High57.5ns
Valid OE Before PD High00ns
Valid Clock Before PD High00ns
Input Don’t Care After PD High57.5ns
OE Don’t Care After PD High57.5ns
Clock Don’t Care After PD High57.5ns
PD Low to Valid Input57.5ns
PD Low to Valid OE1520ns
PD Low to Valid Clock1520ns
PD Low to Valid Output2025ns
2. HI-Z outputs remain HI-Z.
(1, 2, 3)
-5-7
MinMaxMinMax
3. Clock and input transitions are ignored.
Units
4
ATF16V8C
ATF16V8C
Input Test Waveforms and
Measurement Levels:
tR, tF < 1.5ns (10% to 90%)
Pin Capacitance
C
IN
C
OUT
Note:1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
(f = 1 MHz, T = 25°C)
TypMaxUnitsConditions
58pFV
68pFV
(1)
Output Test Loads:
Commercial
= 0V
IN
OUT
= 0V
Power Up Reset
The ATF16V8C’s registers are designed to reset during
power up. At a point delayed slightly from V
, all registers will be reset to the low state. As a result,
V
RST
the registered output state will always be high on powerup.
This feature is critical for state machine initialization. However, 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
must be met before driving the clock term high, and
3) The signals from which the clock is derived must remain stable during t
rise must be monotonic, from below .7 volts,
CC
actually rises in the system, the fol-
CC
.
PR
crossing
CC
Parameter DescriptionTypMaxUnits
t
V
PR
RST
Power-Up
Reset Time
Power-Up
Reset
Voltage
6001,000ns
3.84.5V
5
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