IDT54/74FCT88915TT 55/70/100/133
LOW SKEW PLL-BASED CMOS CLOCK DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
∆ICC
ICCD
CPD
IC
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
Current(4)
Power Dissipation Capacitance
Total Power Supply Current(5,6)
Test Conditions(1)
VCC = Max.
VIN = VCC –2.1V(3)
VCC = Max.
All Outputs Open
VIN = VCC
VIN = GND
50% Duty Cycle
VCC = Max.
PLL_EN = 1, LOCK = 1, FEEDBACK = Q/2
SYNC frequency = 20MHz. Q/2 loaded with 50pF
All other outputs open
Min. Typ.(2) Max.
— 0.5 1.5
— 0.25 0.4
—
15
40
—
25
40
Unit
mA
mA/
MHz
pF
mA
VCC = Max.
PLL_EN = 1, LOCK = 1, FEEDBACK = Q/2
—
42
60 mA
SYNC frequency = 20MHz. Q/2 loaded with 50Ω
Thevenin termination. All other outputs open
NOTES:
3072 tbl 05
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input; all other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. It is derived with Q frequency as the reference.
5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (f) + ILOAD
ICC = Quiescent Current (ICCL, ICCH and ICCZ)
∆ICC = Power Supply Current for a TTL High Input
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f = 2Q frequency
ILOAD = Dynamic Current due to load.
SYNC INPUT TIMING REQUIREMENTS
Symbol
Parameter
Min.
Max. Unit
TRISE/FALL Rise/Fall Times,
—
3.0
ns
SYNC inputs
(0.8V to 2.0V)
Frequency Input Frequency,
10(1)
2Q fmax MHz
SYNC Inputs
Duty Cycle Input Duty Cycle,
25%
75%
—
SYNC Inputs
3053 tbl 06
OUTPUT FREQUENCY SPECIFICATIONS
Max.(2)
Symbol
f2Q
fQ
Parameter
Operating frequency 2Q Output
Operating frequency Q0-Q4, Q5 Outputs
Min.
55
40
55
70
100
133
Unit
70
100
133
MHz
20
27.5
35
50
66.7
MHz
fQ/2
Operating frequency Q/2 Output
10
13.75
17.5
25
33.3
MHz
NOTES:
3072 tbl 07
1. Note 8 in "General AC Specification Notes" and Figure 2 describes this specification and its actual limits depending on the feedback connection.
2. Maximum operating frequency is guaranteed with the part in a phase locked condition and all outputs loaded.
9.7
4