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What is UPB8284?

This electronic component, produced by the manufacturer "NEC", performs the same function as "CLOCK GENERATOR AND DRIVER".


UPB8284 Datasheet PDF - NEC

Part Number UPB8284
Description CLOCK GENERATOR AND DRIVER
Manufacturers NEC 
Logo NEC Logo 


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NEe Microcomputers, Inc.
CLOCK GENERATOR AND DRIVER FOR
8086/8088 MICROPROCESSORS
N'EC
!J.PB8284
DESCR IPTION
The j.lPBB284 is a clock generator and driver for the B086 and 8088 microprocessors
This bipolar driver provides the microprocessor with a reset signal and also provides
properly synchronized READY timing. A TTL clock is also provided for peripheral
devices.
FEATU RES
Generate System Clock for the 8086 and 8088
• Frequency Source can be a Crystal or a TTL Signal
• MOS Level Output for the Processor
• TTL Level Output for Peripheral Devices
• Power-Up Reset for the Processor
• READY Synchronization
• +5V Supply
• 18 Pin Package
PIN CONFIGURATION
CYSNC
PCLK
AENi'
RDY1
RDY2
AEiii2
CLK
GND
PIN NAMES
VCC
X1
X2
TNK
EFI
Fie
OSC
REs
RESET
X1. X2
TANK
FIC
EFI
CSYNC
RDY1}
RDY2
~}
AEN2
RES
RESET
OSC
CLK
PCLK
READY
Crystal Connections
For Overtone Crystal
Clock Source Select
External Clock Input
Clock Synchronization Input
Ready Signal from
Multibus™* Systems
Address Enable Qualifiers
for the two R DY Signals
Reset Input
Synchronized Reset Output
Oscillator Output
MOS Clock for the Processor
TTL Clock for Peripherals
Synchronized Ready Output
*TM - Multibus is a trademark of Intel Corporation.
II
673

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UPB8284 equivalent
,.,. PB8284
AC CHARACTERISTICS
TIMING REQUIREMENTS
PARAMETER
SYMBOL
MIN
TEST
MAX UNITS CONDITIONS
External Frequency High Time
External Frequency Low Time
EFI Period
XTAL Frequency
ROY1, RDY2 Set-Up to elK
ROY1, RDY2 Hold to elK
AEN1, AEN2 Set-Up to ROY1, RDY2
AEN1, AEN2 Hold to elK
CSYNC Set-Up to EFt
CSYNC Hold to EFt
CSYNCWidth
RES Set-Up to elK
RES Hold to elK
TIMING RESPONSES
TEHEL
TELEH
TELEL
TR1VCL
TCLR1X
TA1VR1V
TCLA1X
TYHEH
TEHYL
TVHYL
TllHCL
TCLI1H
20
20
TEHEL + TELEH + lj
12
35
0
15
0
20
20
2 TELEL
65
20
25
ns 90%-90% VIN
ns 10%-10% VIN
ns (j)
MHz
ns
ns
ns
ns
ns
ns
ns
ns @
ns @
PARAMETER
elK Cycle Period
elK High Time
elK Low Time
elK Rise and Fall Time
PCLK High Time
PCLK Low Time
Ready Inactive to elK
Ready Active to elK
elK To Reset Delay
CLK to PCLK High Delay
eLK to PClK low Delay
OSC to CLK High Delay
OSC to ClK low Delay
~
@
SYMBOL
TCLCL
TCHCL
TCLCH
TCH1CH2
TCL2CL1
TPHPL
TPLPH
TRYLCL
TRYHCH
TCLIL
TCLPH
TCLPL
TOLCH
TOLCL
MIN
125
11/3 TCLCL) +2.0
12/3 TCLCL) -15.0
TCLCL -20
TCLCL -20
-8
12/3 TCLCL) -15.0
-5
2
MAX
10
40
22
22
12
20
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
TEST
CONDITIDNS
Figure 3 and Figure 4
Figure 3 and Figure 4
1.0V to 3.5V
Figure 5 and Figure 6
Figure 5 and Figure 6
Notes:
CD 8 = EFI rise (5 ns max) + EFI fall (5 ns max).
~ Set up and hold only necessary to guarantee recognition at next clock.
3 Appl ies only to T3 and TW states.
4 Applies only to T2 states.
TIMING WAVEFORMS*
____~r-------------~"-mt=
+ALL TIMING MEASUREMENTS ARE MADE AT 1.5V UNLESS OTHERWISE NOTED.
677


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UPB8284 electronic component.


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Featured Datasheets

Part NumberDescriptionMFRS
UPB8282The function is (UPB8282 / UPB8283) 8-BIT LATCHES. NECNEC
UPB8283The function is (UPB8282 / UPB8283) 8-BIT LATCHES. NECNEC
UPB8284The function is CLOCK GENERATOR AND DRIVER. NECNEC

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