CY7C342B
7
Commercial and I ndustri al External Synchronous Switching Characteristics[6] O ver Operat i ng R a n g e
7C342B–12 7C342B–15 7C342B–20
Parameter Description Min. Max. Min. Max. Min. Max. Unit
tPD1 Dedicated Input to Combinatorial Output Delay[7] 12 15 20 ns
tPD2 I/O Input to Combinatorial Output Delay[8] 20 25 32 ns
tPD3 Dedicated Input to Combinatorial Output Delay with
Expander Delay[9] 18 23 30 ns
tPD4 I/O Input to Combinatorial Output Delay with Expander
Delay[4,10] 26 33 42 ns
tEA Input to Output Enable Delay[4,7] 12 15 20 ns
tER Input to Output Di sable Delay[4,7] 12 15 20 ns
tCO1 Synchronous Clock Input to Output Delay 6 7 8 ns
tCO2 Synchronous Clock to Local Feedback to
Combinatorial Output [4,11] 14 17 20 ns
tS1 Dedicated Input or Feedback Set-Up Time to
Synchronous Clock Input[4,12] 810 13 ns
tS2 I/O Input Set-Up Time to Synchronous Clock Input[7] 16 20 24 ns
tHInput Hold Time from S ynchronous Clock Input[7] 0 0 0 ns
tWH Synchronous Clock Input HIGH Tim e 4.5 5 7 ns
tWL Synchronous Clock Input LOW Time 4.5 5 7 ns
tRW Asynchronous Clear Widt h[4,7] 12 15 20 ns
tRR Asynchronous Clear Recovery Time[4, 7] 12 15 20 ns
tRO Asyn chronous Clear to Registered Output Delay[7] 12 15 20 ns
tPW Asynchronous Preset W idth[4,7] 12 15 20 ns
tPR Asynchronous Preset Recovery Time[4,7] 12 15 20 ns
tPO Asynchronous Preset to Register ed Output Del ay[7] 12 15 20 ns
tCF Synchronous Clock to L ocal Feedback Input[4,13] 3 3 3 ns
tPExternal Synchronous Clock Period (1/(fMAX3))[4] 912 15 ns
fMAX1 External Feedback Maximum Fre quency
(1/(tCO1 + tS1))[4,14] 71.4 58.8 47.6 MHz
fMAX2 Internal Local Feedback Maximum Frequency, lesser of
(1/(tS1 + tCF)) or (1/tCO1)[4,15] 90.9 76.9 62.5 MHz
Notes:
7. This specification is a measure of the delay from input signal applied to a dedicated input (68-pin PLCC input pin 1, 2, 32, 34, 35, 66, or 68) to combinatorial
output on any output pin. This delay assumes no expander terms are used to form the logic function.
When th is note is appli ed to any parameter specificati on it indicates that the signal (d ata, asynchrono us clo ck, a synchronous clear, and/or a synchronous
preset) is applied to a dedicated input only and no signal path (either clock or data) employs expander logic.
If an input signal is applied to an I/O pin an additional delay equal to tPIA shoul d be added to t he com para ble delay for a dedica t ed inpu t. If expan d ers are
used, add the maximum expander delay tEXP to the overall delay for the comparable delay without expanders.
8. This specification is a measure of the delay from input signal applied to an I/O macroc ell pin to any output. This delay assumes no expander terms are used
to form the logic function.
9. This specification is a measure of the delay from an input signal applied to a dedicated input (68-pin PLCC input pin 1, 2, 32, 34, 35, 36, 66, or 68) to combinatorial output
on any output pin. This delay assumes expander terms are used to form the logic function and includes the worst-case expander logic delay for one pass through the
expander logic.
10. This specification is a measure of the delay from an input signal applied to an I/O macroc ell pin to any output. This delay assumes expander terms are used
to form the logic function and includes the worst-case expander logic delay for one pass through the expander logic. This parameter is tested periodically by
sampling production material.
11. This specification is a measure of the delay from synchronous register clock to internal feedback of the register output signal to the input of the LAB logic
array and then to a combinatorial output. This delay assumes no expanders are used, register is synchronously clocked and all feedback is within the same
LAB. This parameter is tested periodically by sampling production material.
12. If data is applied to an I/O input for capture by a macrocell register , the I/O pin input set-up time minimums should be observed. These parameters are tS2 for
synchronous operation and tAS2 for asynchronous operation.
13. This specification is a measure of the delay associated with the internal register feedback path. This is the delay from synchronous clock to LAB logic array
input. This delay plus the register set-up time, tS1, is the minimum internal period for an internal s ynchronous state machine configuration. This delay is for feedbac k
within the same LAB. This parameter is tested periodically by sampling production material.
14. This specification indicates the guaranteed maximum frequency, in synchronous mode, at which a state machine configuration with external feedback can
operate. It is assumed that all data inputs and feedback signals are applied to dedicated inputs. All feedback is assumed to be local originating within the
same LAB.
15. This specification indicates the guaranteed maximum frequency at which a state machine with internal-only feedback can operate. If register output states
must also control external points, this frequency can still be observed as long as this frequency is less than 1/tCO1.