ER3-8M TechTools, ER3-8M Datasheet - Page 22

• Manufacturer Part Number: ER3-8M
• Description: EMULATOR EPROM ECONOROM III 8MEG
• Manufacturer: TechTools
• Series: EconoROM™ IIIr
• Type: Memoryr

Specifications of ER3-8M

• Contents: ER3 EconoROM III Emulator, Cables (Daisy-chain, LPT and Target) and more
• For Use With/related Products: EPROMs
• For Use With: CBL08-25 - 25 FT DOWNLOAD CABLE UPGRADEC32D-6 - 6" TARGET CABLE IDC TO 32PIN DIPC28D-6 - 6" TARGET CABLE IDC TO 28PIN DIPPS-RT1 - EXTERNAL PWR SUPPLY
• Other names: ER38M

FAQs
Can I use EconoROM III on a 3V target?
YES, but you will need an external power supply. Connect 5VDC at 300ma or greater to the emulator’s
external power connector. External power supplies are available form TechTools.
What is the lowest target voltage supported?
EconoROM III was designed to support 3.0V to 5.0V targets. However, it CAN support lower voltage
targets within limits. Three things set the lower limit; Logic INPUT thresholds, Vout HIGH from the
emulator, and the target isolation threshold.
Bottom line: You CAN emulate lower voltage targets as long as you can tolerate 3.2V on your data bus,
your target provides logic highs of at least 1.5V and our low voltage cut-off circuit does not kick-in.
How accurate are EconoROM III’s voltage readings?
The readings are typically accurate to +- 150mv.
Can EconoROM III emulate FLASH devices?
YES and NO. The emulator does NOT support target writes. However, if your target doesn’t need to
WRITE to the emulator, then emulation is possible as long as the pin-outs match or are adapted. EPROM
and FLASH devices have very similar pin-outs but vary slightly to allow for the extra write/program line
required by the FLASH device. EconoROM III is compatible with the timing requirements of both
EPROM and FLASH devices.
EconoROM III User’s Manual
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Logic INPUT Thresholds. EconoROM III will accept a Vin HIGH minimum of 1.5Volts. Your
target MUST produce at least 1.5V for logic HIGHs. Most logic down to about 2V can meet this
requirement.
3.2Volts. This depends entirely on your target design.
Target Isolation Threshold: To allow safe target power cycling,, EconoROM III constantly
monitors the target’s voltage. When it detects that the target voltage has dropped below a fixed
threshold, it assumes the target is powering down so it turns off its output buffers to avoid leaking
current into the target. It also asserts reset and turns the STATUS LED RED. If the emulator did
NOT provide this safety feature, it could start reverse biasing devices on the target, potentially
causing damage. Even if the target were not damaged, the current leakage could prevent the target
from properly powering down. This could prevent the reset circuitry from operating. This cut-off
threshold is approximate 2.7 to 2.8V.
Vout HIGH levels: Your target must tolerate logic HIGHs from the emulator data lines of
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