Intel III 450 MHz 80525PY450512 Data Sheet

Product codes
80525PY450512
Page of 101
Datasheet
21
Electrical Specifications
NOTES:
1. The BR0# pin is the only BREQ# signal that is bidirectional. The internal BREQ# signals are mapped onto 
BR# pins after the agent ID is determined. See 
 for more information.
2. See 
 for information on the PWRGOOD signal.
3. See 
 for information on the SLP# signal.
4. See 
 for information on the THERMTRIP# signal.
5. These signals are specified for 2.5 V operation.
6. V
CCCORE
 is the power supply for the processor core.
V
CCL2
/V
CC3.3
 is described in 
VID[4:0] is described in 
.
V
TT
 is used to terminate the system bus and generate V
REF
 on the processor substrate.
V
SS
 is system ground.
TESTHI should be connected to 2.5 V with a 1 k
Ω
 –10 k
Ω
 resistor.
V
CC5
 is not connected to the Pentium III processor core. This supply is used for the test equipment and tools.
SLOTOCC# is described in 
.
BSEL[1:0] is described in 
 and 
.
EMI pins are described in 
.
THERMDP, THERMDN are described in 
.
2.8.1
Asynchronous vs. Synchronous for System Bus Signals
All AGTL+ signals are synchronous to BCLK. All of the CMOS, Clock, APIC, and TAP signals 
can be applied asynchronously to BCLK.
All APIC signals are synchronous to PICCLK. All TAP signals are synchronous to TCK.
Table 4.  System Bus Signal Groups
Group Name
Signals
AGTL+ Input
BPRI#, BR1#, DEFER#, RESET#, RS[2:0]#, RSP#, TRDY#
AGTL+ Output
PRDY#
AGTL+ I/O
A[35:3]#, ADS#, AERR#, AP[1:0]#, BERR#, BINIT#, BNR#, BP[3:2]#, BPM[1:0]#, 
BR0#
1
, D[63:0]#, DBSY#, DEP[7:0]#, DRDY#, HIT#, HITM#, LOCK#, REQ[4:0]#, RP#
CMOS Input
5
A20M#, FLUSH#, IGNNE#, INIT#, LINT0/INTR, LINT1/NMI, PREQ#, PWRGOOD
2
SMI#, SLP#
3
, STPCLK#
CMOS Output
5
FERR#, IERR#, THERMTRIP#
4
System Bus Clock
BCLK
APIC Clock
PICCLK
APIC I/O
5
PICD[1:0]
TAP Input
5
TCK, TDI, TMS, TRST#
TAP Output
5
TDO
Power/Other
6
V
CCCORE
, V
CCL2
/V
CC3.3
, V
CC5
, VID[4:0], V
TT
, V
SS
, SLOTOCC#, THERMDP, THERMDN, 
BSEL[1:0], EMI, TESTHI, Reserved